JP2020154288A - Zoom lens system, lens barrel, and image capturing device - Google Patents

Abstract

To provide a zoom lens system which offers good focusing performance, reduced size and weight of a focusing group and thus of the entire lens system, and minimizes a reduction in shooting magnification in short distance shooting, and to provide a lens barrel and image capturing device.SOLUTION: A second lens group G2 consists of, in order from the object side, a 2a lens group G2a having positive refractive power, a 2b lens group G2b having negative refractive power, and a 2c lens group G2c having negative refractive power. When shifting focus from infinity to a short distance, the 2b lens group G2b moves toward the image side, while changing a distance from the 2a lens group G2a to the 2b lens group G2b and a distance from the 2b lens group G2b to the 2c lens group G2c.SELECTED DRAWING: Figure 1

Description

The present invention relates to a zoom lens system, a lens barrel, and an imaging device.

Conventionally, various types are known as a zoom lens system mounted on a digital camera (for example, for a digital single-lens reflex camera) which is an imaging device. In particular, as a zoom lens system in which the focal length on the telephoto side (long focal length end side) is extended, a positive lead type zoom type in which positive, negative, and rear groups are generally used in order from the object side is used. Therefore, it is required to be a compact optical system having high optical performance in the entire zoom / shooting distance range. Further, in order to achieve high-speed automatic focusing operation (autofocus) and weight reduction of the focusing lens group, an inner focus method in which the inner lens group is moved rather than the heavier front lens is generally already known.

Patent Document 1 describes a zoom lens system having a positive / negative / positive / positive 4-group zoom configuration. In this zoom lens system, focusing is performed by moving the positive first lens group toward the object side (the positive first lens group constitutes the focusing lens group). In the zoom lens system of Patent Document 1, it is difficult for the shooting magnification to decrease, but the weight of the focusing lens becomes large, and it is difficult to realize high-speed AF.

Patent Document 2 describes a zoom lens system having a positive / negative / positive / positive 4-group zoom configuration. In this zoom lens system, the positive first lens group is divided into a first A sub lens group and a first B sub lens group. Therefore, it is conceivable to perform focusing by moving either the first A sub-lens group or the first B sub-lens group toward the object side. Compared with the zoom lens system of Patent Document 1, the zoom lens system of Patent Document 2 can reduce the number of focusing lenses and reduce the weight. On the other hand, since the outer diameter of the lens does not change so much, the focusing lens becomes heavier than before, and it is difficult to realize high-speed AF.

Patent Document 3 describes a zoom lens system having a positive / negative / positive / positive 4-group zoom configuration. In this zoom lens system, focusing is performed by moving the negative second lens group toward the object side (the negative second lens group constitutes the focusing lens group). The zoom lens system of Patent Document 3 can have a smaller lens outer diameter than the zoom lens system of Patent Documents 1 and 2, but since the number of focusing lenses is large, a certain amount of weight increase is unavoidable. Further, in the infinity shooting state at the telephoto end (long focal length end), the second lens group, which is a focusing lens group, and the positive third lens group arranged on the image side thereof are close to each other. Since the second lens group and the third lens group that are close to each other have a certain degree of strong refractive power, the effect of the scaling effect increases as the distance between the second lens group and the third lens group changes during focusing. The shooting magnification tends to decrease.

Patent Document 4 describes a zoom lens system having a positive / negative positive / negative 5-group zoom configuration or a positive / negative positive / negative 6-group zoom configuration. In this zoom lens system, focusing is performed by moving the negative fifth lens group to the image side (the negative fifth lens group constitutes the focusing lens group). Since the fifth lens group, which is a focusing lens group, is located on the image side, the focusing lens group can be made lighter than the zoom lens systems of Patent Documents 1 and 2, and is also suitable for high-speed AF. ..

Japanese Unexamined Patent Publication No. 2010-217838 Japanese Unexamined Patent Publication No. 2011-158630 Japanese Patent No. 4914991 Japanese Unexamined Patent Publication No. 2017-015930

However, in the conventional zoom lens system, when the inner focus method is adopted, in order to reduce the amount of lens movement during focusing and realize high-speed autofocus, the refractive power of the focusing lens group and the lens group adjacent to it is determined. It has the opposite sign to the focusing lens group and has a relatively strong refractive power (it must be). As a result, when focusing is performed using the inner focus method, not only focusing but also scaling occurs, and the focal length becomes shorter when shooting a short-distance subject, especially on the telephoto side, compared to when shooting a distant view. It ends up. For this reason, the inner focus method has a problem that the shooting magnification at the time of shooting at a short distance becomes small.

Further, in the zoom lens system of Patent Document 4, in the infinity shooting state, the negative fifth lens group, which is a focusing lens group, and the positive fourth lens group arranged on the object side thereof are located close to each other. Both have a strong refractive power to some extent. Therefore, there is a problem that the imaging magnification is lowered as a result of the influence of the scaling effect being increased by changing the distance between the fourth lens group and the fifth lens group during focusing.

The present invention has been completed based on the above awareness of the problem, and is suitable for focusing, downsizing and weight reduction of the focusing lens group and the entire lens system, and suppressing a decrease in shooting magnification in short-distance photography. It is an object of the present invention to provide a possible zoom lens system, lens barrel and imaging device.

The zoom lens system of the present embodiment is composed of a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a succeeding lens group in order from the object side, and has a short focal distance end. When scaling from to the long focal distance end, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the subsequent lens group decreases, and the second lens group starts from the object side. It is composed of a second a lens group with a positive refractive power, a second b lens group with a negative refractive power, and a second c lens group with a negative refractive power. When focusing from infinity to a short distance, the second b As the lens group moves to the image side, the distance between the second a lens group and the second b lens group and the distance between the second b lens group and the second c lens group change.

In the zoom lens system of the present embodiment, the composite optical system of the second a lens group and the second b lens group is defined as the second ab lens group, and the composite optical system of the second b lens group and the second c lens group is defined as the second bc lens group. When specified, it is preferable that at least one of the following conditional expressions (1), (2), (3), (4), (5), and (6) is satisfied.
(1) 0.3 <D2bc / (-f2) <1.0
(2) 0.3 <D2bc / D2 <1.0
(3) 0.3 <H2_2bc / (-f2bc)
(4) 0.2 <HH_2bc / (-f2bc)
(5) 0 <H1-2 / D2 <0.9
(6) 0 <H1-2ab / D2 <1.0
However,
D2bc: Distance between the 2b lens group and the 2c lens group at infinity focusing,
f2: Focal length of the second lens group,
D2: Thickness on the optical axis of the second lens group,
H2_2bc: The distance on the optical axis from the most image-side surface of the second bc lens group to the posterior principal point position of the second bc lens group.
f2bc: Focal length of the second bc lens group at infinity focus,
HH_2bc: Distance on the optical axis from the front principal point position to the posterior principal point position, which is the distance between the principal points of the second bc lens group.
H1-2: Distance on the optical axis from the most object-side surface of the second lens group to the front principal point position,
H1-2ab: The distance on the optical axis from the surface on the most object side of the second ab lens group to the position of the principal point on the front side.
Is.

In the following, each of the conditional expressions (1), (2), (3), (4), (5), and (6) will be described.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (1).
(1) 0.3 <D2bc / (-f2) <1.0
However,
D2bc: Distance between the 2b lens group and the 2c lens group during infinity focusing (distance on the optical axis from the surface apex on the image side of the 2b lens group to the surface apex on the object side of the 2c lens group) ),
f2: Focal length of the second lens group,
Is.

Among the conditional expression range of the conditional expression (1), it is more preferable to satisfy the following conditional expression (1').
(1') 0.4 <D2bc / (-f2) <1.0

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (2).
(2) 0.3 <D2bc / D2 <1.0
However,
D2bc: Distance between the 2b lens group and the 2c lens group during infinity focusing (distance on the optical axis from the surface apex on the image side of the 2b lens group to the surface apex on the object side of the 2c lens group) ),
D2: Thickness on the optical axis of the second lens group,
Is.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (3) when the synthetic optical system of the second b lens group and the second c lens group is defined as the second bc lens group.
(3) 0.3 <H2_2bc / (-f2bc)
However,
H2_2bc: The distance on the optical axis from the most image-side surface of the second bc lens group to the posterior principal point position of the second bc lens group.
f2bc: Focal length of the second bc lens group at infinity focus,
Is.

Among the conditional expression range of the conditional expression (3), it is more preferable to satisfy the following conditional expression (3').
(3') 0.4 <H2_2bc / (-f2bc) <1.0

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (4) when the synthetic optical system of the second b lens group and the second c lens group is defined as the second bc lens group.
(4) 0.2 <HH_2bc / (-f2bc)
However,
HH_2bc: Distance on the optical axis from the front principal point position to the posterior principal point position, which is the distance between the principal points of the second bc lens group.
f2bc: Focal length of the second bc lens group at infinity focus,
Is.

Among the conditional expression range of the conditional expression (4), it is more preferable to satisfy the following conditional expression (4').
(4') 0.3 <HH_2bc / (-f2bc) <1.0

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (5).
(5) 0 <H1-2 / D2 <0.9
However,
H1-2: Distance on the optical axis from the most object-side surface of the second lens group to the front principal point position,
D2: Thickness on the optical axis of the second lens group,
Is.

Among the conditional expression range of the conditional expression (5), it is more preferable to satisfy the following conditional expression (5').
(5') 0.4 <H1-2 / D2 <0.9

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (6) when the synthetic optical system of the second a lens group and the second b lens group is defined as the second ab lens group.
(6) 0 <H1-2ab / D2 <1.0
However,
H1-2ab: The distance on the optical axis from the surface on the most object side of the second ab lens group to the position of the principal point on the front side.
D2: Thickness on the optical axis of the second lens group,
Is.

Among the conditional expression range of the conditional expression (6), it is more preferable to satisfy the following conditional expression (6').
(6') 0.2 <H1-2ab / D2 <0.8

The second c lens group may have at least two negative lenses and at least one positive lens.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (7).
(7) 1.5 <f2a / (-f2b) <6.5
However,
f2a: Focal length of the 2nd a lens group,
f2b: Focal length of the 2nd b lens group,
Is.

Among the conditional expression range of the conditional expression (7), it is more preferable to satisfy the following conditional expression (7').
(7') 2.0 <f2a / (-f2b) <6.0

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (8).
(8) 0.5 <f2b / f2c <2.5
However,
f2b: Focal length of the 2nd b lens group,
f2c: Focal length of the 2nd lens group,
Is.

Among the conditional expression range of the conditional expression (8), it is more preferable to satisfy the following conditional expression (8').
(8') 0.8 <f2b / f2c <2.0

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (9) when the synthetic optical system of the second b lens group and the second c lens group is defined as the second bc lens group.
(9) 4 <f2a / (-f2bc) <20
However,
f2a: Focal length of the 2nd a lens group,
f2bc: Focal length of the second bc lens group at infinity focus,
Is.

Among the conditional expression range of the conditional expression (9), it is more preferable to satisfy the following conditional expression (9').
(9') 5 <f2a / (-f2bc) <18

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (10).
(10) 0.4 <(R2_2a-R1_2a) / (R2_2a + R1_2a) <3.0
However,
R1-2a: Paraxial radius of curvature of the surface closest to the object in the second a lens group,
R2_2a: Paraxial radius of curvature of the surface closest to the image side of the 2nd a lens group,
Is.

Among the conditional expression range of the conditional expression (10), it is more preferable to satisfy the following conditional expression (10').
(10') 0.4 <(R2_2a-R1_2a) / (R2_2a + R1-2a) <2.5

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (11).
(11) 0.40 << R2_2a | / f2a
However,
R2_2a: Paraxial radius of curvature of the surface closest to the image side of the 2nd a lens group,
f2a: Focal length of the 2nd a lens group,
Is.

Within the conditional expression range of the conditional expression (11), it is more preferable that the following conditional expression (11') and further the following conditional expression (11 ") are satisfied.
(11') 1.0 << R2_2a | / f2a <3.0
(11 ") 1.2 << R2_2a | / f2a <3.0

The second a lens group has at least one positive lens, and it is preferable that the following conditional expression (12) is satisfied.
(12) 45 <2apMAX_νd
However,
2apMAX_νd: The Abbe number of the positive lens having the largest Abbe number among the positive lenses of the second a lens group.
Is.

Within the conditional expression range of the conditional expression (12), it is more preferable to satisfy the following conditional expression (12') and further the following conditional expression (12 ").
(12') 50 <2apMAX_νd
(12 ") 55 <2apMAX_νd

The second a lens group may have at least one negative lens.

The second a lens group has at least one negative lens, and is characterized by satisfying the following conditional expression (13).
(13) 0.2 <(-f2anMAX) / f2a
However,
f2anMAX: Focal length of the negative lens with the largest refractive power among the negative lenses in the 2nd a lens group.
f2a: Focal length of the 2nd a lens group,
Is.

Within the conditional expression range of the conditional expression (13), it is more preferable to satisfy the following conditional expression (13') and further the following conditional expression (13 ").
(13') 0.5 <(-f2anMAX) /f2a<2.8
(13 ") 0.7 <(-f2anMAX) /f2a<2.5

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (14).
(14) 0.4 <(R1_2b-R2_2b) / (R1-2b + R2_2b) <2.5
However,
R1-2b: Paraxial radius of curvature of the surface of the second b lens group on the most object side,
R2_2b: Paraxial radius of curvature of the surface closest to the image of the 2nd lens group,
Is.

Within the conditional expression range of the conditional expression (14), it is more preferable that the following conditional expression (14') and the following conditional expression (14 ") are satisfied.
(14') 0.5 <(R1_2b-R2_2b) / (R1-2b + R2_2b) <2.0
(14 ") 0.6 <(R1_2b-R2_2b) / (R1-2b + R2_2b) <1.6

The second b lens group has a negative lens located closest to the object side, and preferably satisfies the following conditional expression (15).
(15) 30 <2bn_νd
However,
2bn_νd: Abbe number of the negative lens located closest to the object in the 2b lens group,
Is.

Within the conditional expression range of the conditional expression (15), it is more preferable that the following conditional expression (15') and further the following conditional expression (15 ″) are satisfied.
(15') 40 <2bn_νd
(15 ") 45 <2bn_νd

The second b lens group may be composed of one negative lens and one positive lens located in order from the object side.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (16).
(16) 0.1 <(-f2bn) /f2bp <0.7
However,
f2bn: Focal length of the negative lens of the 2nd b lens group,
f2bp: Focal length of the positive lens of the 2nd b lens group,
Is.

Within the conditional expression range of the conditional expression (16), it is more preferable that the following conditional expression (16') and further the following conditional expression (16 ") are satisfied.
(16') 0.4 <(-f2bn) /f2bp <0.7
(16 ") 0.4 <(-f2bn) /f2bp<0.5

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (17).
(17) 20 <2bn_νd-2bp_νd
However,
2bn_νd: Abbe number of negative lenses in the 2nd b lens group,
2bp_νd: Abbe number of positive lenses in the 2nd b lens group,
Is.

Among the conditional expression range of the conditional expression (17), it is more preferable to satisfy the following conditional expression (17').
(17') 24 <2bn_νd-2bp_νd

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (18).
(18) fW / | f1-2bW | <0.5
However,
fW: Focal length of the entire system at infinity focusing at the short focal length end,
f1-2bW: Combined focal length from the first lens group to the second b lens group at infinity focusing at the short focal length end,
Is.

Within the conditional expression range of the conditional expression (18), it is more preferable to satisfy the following conditional expression (18') and further the following conditional expression (18 ").
(18') fW / | f1-2bW | <0.4
(18 ”) fW / | f1-2bW | <0.3

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (19).
(19) (1-M_2bt ² ) · M_2bRt ² <-3.0
However,
M_2bt: Lateral magnification of the 2b lens group at infinity focusing at the long focal length end,
M_2bRt: Synthetic lateral magnification of all lens groups on the image side of the 2b lens group at infinity focusing at the long focal length end.
Is.

Within the conditional expression range of the conditional expression (19), it is more preferable that the following conditional expression (19') and further the following conditional expression (19 ") are satisfied.
(19') (1-M_2bt ² ) · M_2bRt ² <-5.0
(19 ") (1-M_2bt ² ) · M_2bRt ² <-8.0

An anti-vibration lens group that moves in a direction including an optical axis orthogonal component to displace the imaging position may be provided on the image side of the second b lens group.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (20).
(20) 0.9 << (1-M_SRt) · M_SRRt | <3.5
However,
M_SRt: Lateral magnification of the anti-vibration lens group at infinity focusing at the long focal length end,
M_SRRt: Composite lateral magnification of all lens groups on the image side of the anti-vibration lens group at infinity focusing at the long focal length end.
Is.

Within the conditional expression range of the conditional expression (20), it is more preferable that the following conditional expression (20') and further the following conditional expression (20 ″) are satisfied.
(20') 1.1 << (1-M_SRt) · M_SRRt | <3.0
(20 ") 1.2 << (1-M_SRt) · M_SRRt | <2.5

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (21).
(21) 0.4 <f2b <fSR <2.5
However,
f2b: Focal length of the 2nd b lens group,
fSR: Focal length of anti-vibration lens group,
Is.

Within the conditional expression range of the conditional expression (21), it is more preferable to satisfy the following conditional expression (21') and further the following conditional expression (21 ″).
(21') 0.6 <f2b <fSR <2.3
(21 ”) 0.8 <f2b <fSR <2.0

The lens group including the anti-vibration lens group does not have to move in the optical axis direction when scaling from the short focal length end to the long focal length end.

The second lens group does not have to move in the optical axis direction when scaling from the short focal length end to the long focal length end.

The first lens group does not have to move in the optical axis direction when scaling from the short focal length end to the long focal length end.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (22).
(22) 0.8 <(fT / fW) / (M2T / M2W) <3.5
However,
fT: Focal length of the entire system at infinity focusing at the long focal length end,
fW: Focal length of the entire system at infinity focusing at the short focal length end,
M2T: Lateral magnification of the second lens group at infinity focusing at the long focal length end,
M2W: Lateral magnification of the second lens group at infinity focusing at the short focal length end,
Is.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (23).
(23) 0.2 <(-f2) /fW <0.8
However,
f2: Focal length of the second lens group,
fW: Focal length of the entire system at infinity focusing at the short focal length end,
Is.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (24).
(24) 0.3 <f1 / fT <1.1
However,
f1: Focal length of the first lens group,
fT: Focal length of the entire system at infinity focusing at the long focal length end,
Is.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (25).
(25) 0.3 <f1 / (fW ・ fT) ^1/2 <3.0
However,
f1: Focal length of the first lens group,
fW: Focal length of the entire system at infinity focusing at the short focal length end,
fT: Focal length of the entire system at infinity focusing at the long focal length end,
Is.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (26).
(26) 0.1 <(D12T-D12W) / (-f2) <10.0
However,
D12T: Distance between the first lens group and the second lens group at infinity focusing at the long focal length end (from the refracting surface on the most image side of the first lens group to the refracting surface on the most object side of the second lens group). Distance on the optical axis),
D12W: Distance between the first lens group and the second lens group at infinity focusing at the short focal length end (from the refracting surface on the most image side of the first lens group to the refracting surface on the most object side of the second lens group). Distance on the optical axis),
f2: Focal length of the second lens group,
Is.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (27).
(27) 0.1 <(D2RW-D2RT) / (-f2) <10.0
However,
D2RW: Distance between the second lens group and the following lens group at infinity focusing at the short focal length end (optical axis from the refracting surface on the most image side of the second lens group to the refracting surface on the most object side of the succeeding lens group) Distance above),
D2RT: Distance between the second lens group and the following lens group at infinity focusing at the long focal length end (optical axis from the refracting surface on the most image side of the second lens group to the refracting surface on the most object side of the succeeding lens group) Distance above),
f2: Focal length of the second lens group,
Is.

The zoom lens system of the present embodiment preferably satisfies the following conditional expression (28).
(28) 0.5 <(R1_2a) / (R2_2b) <10.0
However,
R1-2a: Paraxial radius of curvature of the surface closest to the object in the second a lens group,
R2_2b: Paraxial radius of curvature of the surface closest to the image of the 2nd lens group,
Is.

Within the conditional expression range of the conditional expression (28), it is more preferable to satisfy the following conditional expression (28') and further the following conditional expression (28 ″).
(28') 0.7 <(R1-2a) / (R2_2b) <8.0
(28 ”) 0.9 <(R1_2a) / (R2_2b) <5.0

The lens barrel of the present embodiment is composed of a first lens group having a positive refractive force, a second lens group having a negative refractive force, and a subsequent lens group in order from the object side, and has a short focal length end. When scaling from to the long focal length end, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the subsequent lens group decreases, and the second lens group starts from the object side. It is composed of a 2a lens group with a positive refractive force, a 2b lens group with a negative refractive force, and a 2c lens group with a negative refractive force, and is used for focusing from infinity to a short distance. Provided is provided with a zoom lens system characterized in that the distance between the second a lens group and the second b lens group and the distance between the second b lens group and the second c lens group change as the lens group moves to the image side. It is characterized by.

The image pickup apparatus of the present embodiment is composed of a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a succeeding lens group in order from the object side, from the short focal distance end. When scaling to the long focal distance end, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the subsequent lens group decreases, and the second lens group moves in order from the object side. It is composed of a second a lens group with a positive refractive power, a second b lens group with a negative refractive power, and a second c lens group with a negative refractive power. When focusing from infinity to a short distance, the second b lens It is provided with a zoom lens system characterized in that the distance between the second a lens group and the second b lens group and the distance between the second b lens group and the second c lens group change as the group moves to the image side. It is a feature.

According to the present invention, a zoom lens system, a lens barrel, and an imaging device capable of preferably performing focusing, reducing the size and weight of the focusing lens group and thus the entire lens system, and suppressing a decrease in shooting magnification in short-distance photography. Can be provided.

It is a conceptual diagram which shows the movement locus at the time of magnification change of the zoom lens system by numerical value Example 1, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive. It is a conceptual diagram which shows the movement locus at the time of magnification change of the zoom lens system by numerical value Example 2, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive. It is a conceptual diagram which shows the movement locus at the time of magnification change of the zoom lens system by numerical value Example 3, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive. It is a conceptual diagram which shows the movement locus at the time of magnification change of the zoom lens system by numerical value Example 4, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive. It is a conceptual diagram which shows the movement locus at the time of magnification change of the zoom lens system by numerical value Example 5, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive. It is a conceptual diagram which shows the movement locus at the time of magnification change of the zoom lens system by numerical value Example 6, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive. It is a conceptual diagram which shows the movement locus at the time of magnification change of the zoom lens system by numerical value Example 7, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive. It is a conceptual diagram which shows the movement locus at the time of magnification change of the zoom lens system by numerical value Example 8, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive. Numerical value It is a lens configuration diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Example 1. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to the first embodiment. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 1. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 1. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 1. It is a lateral aberration diagram at the time of anti-vibration drive of FIG. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to the first embodiment. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 1. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 1. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 1. It is a lateral aberration diagram at the time of vibration isolation drive (± 0.3 °) of FIG. It is a lens block diagram at the time of infinity focusing at the short focal length end of the zoom lens system by the numerical example 2. FIG. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to the second embodiment. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 2. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 2. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 2. It is a lateral aberration diagram at the time of anti-vibration drive of FIG. It is a longitudinal aberration diagram at the time of infinity focusing at the long focal length end of the zoom lens system according to the numerical embodiment 2. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 2. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 2. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 2. It is a lateral aberration diagram at the time of vibration isolation drive (± 0.3 °) of FIG. 28. Numerical value It is a lens configuration diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Example 3. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 3. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 3. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 3. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 3. It is a lateral aberration diagram at the time of anti-vibration drive of FIG. 34. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 3. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 3. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 3. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 3. It is a lateral aberration diagram at the time of vibration isolation drive (± 0.3 °) of FIG. 40. Numerical value It is a lens configuration diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Example 4. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 4. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 4. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 4. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 4. It is a lateral aberration diagram at the time of anti-vibration drive of FIG. 45. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 4. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 4. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 4. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 4. It is a lateral aberration diagram at the time of vibration isolation drive (± 0.3 °) of FIG. Numerical value It is a lens block diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Example 5. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 5. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 5. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 5. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 5. It is a lateral aberration diagram at the time of anti-vibration drive of FIG. 56. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 5. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 5. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 5. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 5. FIG. 6 is a lateral aberration diagram of FIG. 61 during vibration isolation drive (± 0.3 °). Numerical value It is a lens block diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Example 6. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 6. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 6. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 6. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 6. It is a lateral aberration diagram at the time of anti-vibration drive of FIG. 67. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 6. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 6. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 6. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 6. It is a lateral aberration diagram at the time of vibration isolation drive (± 0.3 °) of FIG. 72. It is a lens block diagram at the time of infinity focusing at the short focal length end of the zoom lens system by the numerical example 7. FIG. It is a longitudinal aberration diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Numerical Example 7. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 7. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 7. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 7. It is a lateral aberration diagram at the time of anti-vibration drive of FIG. 78. It is a longitudinal aberration diagram at the time of infinity focusing at the long focal length end of the zoom lens system according to Numerical Example 7. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 7. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 7. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 7. FIG. 8 is a lateral aberration diagram of FIG. 83 during vibration isolation drive (± 0.3 °). Numerical value It is a lens block diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Example 8. It is a longitudinal aberration diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Numerical Example 8. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 8. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 8. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 8. It is a lateral aberration diagram at the time of anti-vibration drive of FIG. 89. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 8. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 8. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 8. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 8. FIG. 9 is a lateral aberration diagram of FIG. 94 during vibration isolation drive (± 0.3 °). It is a conceptual diagram which shows the movement locus at the time of magnification change of the zoom lens system by numerical value Example 9, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive. It is a conceptual diagram which shows the movement locus at the time of magnification change of the zoom lens system by numerical value Example 10, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive. It is a conceptual diagram which shows the movement locus at the time of magnification change, the movement locus at the time of focusing, and the movement locus at the time of anti-vibration drive of the zoom lens system according to Numerical Example 11. It is a lens block diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to the numerical example 9. FIG. It is a longitudinal aberration diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Numerical Example 9. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 9. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 9. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 9. It is a lateral aberration diagram at the time of anti-vibration drive of FIG. 103. It is a longitudinal aberration diagram at the time of infinity focusing at the long focal length end of the zoom lens system according to Numerical Example 9. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 9. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 9. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 9. It is a lateral aberration diagram at the time of vibration isolation drive (± 0.3 °) of FIG. 108. It is a lens block diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Numerical Example 10. It is a longitudinal aberration diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Numerical Example 10. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 10. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Example 10. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 10. It is a lateral aberration diagram at the time of vibration isolation drive of FIG. 114. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 10. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 10. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 10. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 10. It is a lateral aberration diagram at the time of vibration isolation drive (± 0.3 °) of FIG. 119. It is a lens block diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Numerical Example 11. It is a longitudinal aberration diagram at the time of focusing at infinity at the short focal length end of the zoom lens system according to Numerical Example 11. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the short focal length end of the zoom lens system according to Example 11. Numerical value It is a longitudinal aberration diagram at the time of focusing at 0.9 m at the short focal length end of the zoom lens system according to Example 11. Numerical value It is a lateral aberration diagram at the time of infinity focusing at the short focal length end of the zoom lens system according to Example 11. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the short focal length end of the zoom lens system according to Example 11. Numerical value It is a lateral aberration diagram at the time of focusing at 0.9 m at the short focal length end of the zoom lens system according to Example 11. It is a lateral aberration diagram at the time of anti-vibration drive of FIG. 126. Numerical value It is a longitudinal aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 11. Numerical value It is a longitudinal aberration diagram at the time of focusing at 1.2 m at the long focal length end of the zoom lens system according to Example 11. Numerical value It is a longitudinal aberration diagram at the time of focusing at 0.9 m at the long focal length end of the zoom lens system according to Example 11. Numerical value It is a lateral aberration diagram at the time of focusing at infinity at the long focal length end of the zoom lens system according to Example 11. Numerical value It is a lateral aberration diagram at the time of focusing of 1.2 m at the long focal length end of the zoom lens system according to Example 11. Numerical value It is a lateral aberration diagram at the time of focusing at 0.9 m at the long focal length end of the zoom lens system according to Example 11. It is a lateral aberration diagram at the time of vibration isolation drive (± 0.6 °) of FIG. 133. It is a figure which shows an example of the appearance structure of the lens barrel (imaging apparatus) equipped with the zoom lens system by this embodiment.

1 to 8 and 97 to 99 are concepts showing the movement locus of the zoom lens system according to the numerical examples 1 to 11 when the zoom lens system is varied, the movement locus during focusing, and the movement locus during vibration isolation drive. It is a figure. 1 to 8 and 97 to 99 are drawn with reference to the lens configuration at infinity focusing at the short focal length end.

In the zoom lens system according to the present embodiment, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, and the subsequent lens group G2 have a positive refractive power in order from the object side through Numerical Examples 1 to 8. It is composed of a lens group GR.
When scaling from the short focal length end to the long focal length end, the distance between the first lens group G1 and the second lens group G2 increases, and the distance between the second lens group G2 and the subsequent lens group GR decreases.
The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
When focusing from infinity to a short distance, the second b lens group G2b moves to the image side, the distance between the second a lens group G2a and the second b lens group G2b, and the distance between the second b lens group G2b and the second c lens group G2c. The interval changes (the second b lens group G2b constitutes the focus lens group). More specifically, the distance between the second a lens group G2a and the second b lens group G2b increases, and the distance between the second b lens group G2b and the second c lens group G2c decreases.
A parallel flat plate CG is provided in front of the image plane of the image sensor (not shown) on the image side of the subsequent lens group GR. The parallel flat plate CG can be provided with functions such as a low-pass filter, an infrared cut filter, and a cover glass that protects the image pickup surface of the image pickup device.

The above lens configuration and the like are common to Numerical Example 1 to Numerical Example 8. Hereinafter, individual lens configurations and the like of Numerical Examples 1 to 8 will be described.

In the numerical embodiment 1 of FIG. 1, the succeeding lens group GR is the third lens group G3 having a positive refractive power, the fourth lens group G4 having a negative refractive power, and the third lens group G4 having a positive refractive power in this order from the object side. It is composed of a 5-lens group G5 (that is, a positive / negative / negative / positive 5-group zoom lens configuration).
When scaling from the short focal length end to the long focal length end, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and so on. The distance between the adjacent lens groups changes so that the distance between the three lens groups G3 and the fourth lens group G4 increases and the distance between the fourth lens group G4 and the fifth lens group G5 decreases.
When scaling from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, and the fifth lens group G5 move (extend) to the object side, and the second lens group G2 and the second lens group G2 The four lens group G4 is fixed to the image plane. The third lens group G3 and the fifth lens group G5 move (feed out) toward the object side in the same locus. This makes it possible to simplify the mechanical configuration related to zooming.
The fourth lens group G4 is composed of a fourtha lens group G4a having a positive refractive power and a fourthb lens group G4b having a negative refractive power in order from the object side. The fourth b lens group G4b is an anti-vibration lens group that corrects image shake by moving in a direction including an optical axis orthogonal component and displacing the imaging position.
A diaphragm SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (the position immediately before the third lens group G3).

In the numerical examples 2 and 3 of FIGS. 2 and 3, the succeeding lens group GR is, in order from the object side, the third lens group G3 having a positive refractive power, the fourth lens group G4 having a negative refractive power, and negative. It is composed of a fifth lens group G5 having a refractive power of (that is, a positive / negative positive / negative 5 group zoom lens configuration).
When scaling from the short focal length end to the long focal length end, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and so on. The distance between the adjacent lens groups changes so that the distance between the three lens groups G3 and the fourth lens group G4 increases and the distance between the fourth lens group G4 and the fifth lens group G5 decreases.
When scaling from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, and the fifth lens group G5 move (advance) toward the object side with respect to the image plane, and the second lens group G1 is extended. The lens group G2 and the fourth lens group G4 are fixed to the image plane. The third lens group G3 and the fifth lens group G5 move (feed out) toward the object side in the same locus. This makes it possible to simplify the mechanical configuration related to zooming.
The fourth lens group G4 is composed of a fourtha lens group G4a having a positive refractive power and a fourthb lens group G4b having a negative refractive power in order from the object side. The fourth b lens group G4b is an anti-vibration lens group that corrects image shake by moving in a direction including an optical axis orthogonal component and displacing the imaging position.
A diaphragm SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (the position immediately before the third lens group G3).

In the numerical embodiment 4 of FIG. 4, the succeeding lens group GR is, in order from the object side, the third lens group G3 having a positive refractive power, the fourth lens group G4 having a positive refractive power, and the third lens group G4 having a negative refractive power. It is composed of a 5-lens group G5 and a 6th lens group G6 having a negative refractive power (that is, a positive / negative positive / negative 6-group zoom lens configuration).
When scaling from the short focal length end to the long focal length end, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and so on. The distance between the 3rd lens group G3 and the 4th lens group G4 changes (increases or decreases), the distance between the 4th lens group G4 and the 5th lens group G5 changes (increases or decreases), and the distance between the 5th lens group G5 and the 5th lens group G5 6 The spacing between adjacent lens groups changes so that the spacing between the lens groups G6 changes (increases or decreases).
When scaling from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move to the object side. The second lens group G2 is fixed to the image plane. The fourth lens group G4 and the sixth lens group G6 move (feed out) toward the object side in the same trajectory. This makes it possible to simplify the mechanical configuration related to zooming.
The second c lens group G2c is an anti-vibration lens group that corrects image shake by moving in a direction including an optical axis orthogonal component and displacing the imaging position.
A diaphragm SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (the position immediately before the third lens group G3).

In the numerical embodiment 5 of FIG. 5, the succeeding lens group GR is the third lens group G3 having a positive refractive power, the fourth lens group G4 having a negative refractive power, and the third lens group G4 having a negative refractive power in order from the object side. It is composed of a 5-lens group G5 (that is, a positive / negative positive / negative 5-group zoom lens configuration).
When scaling from the short focal length end to the long focal length end, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and so on. Adjacent lens groups so that the distance between the 3 lens group G3 and the 4th lens group G4 changes (increases or decreases) and the distance between the 4th lens group G4 and the 5th lens group G5 changes (increases or decreases). Interval changes.
When scaling from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 move (advance) to the object side, and the second lens group The two lens group G2 is fixed to the image plane. The third lens group G3 and the fifth lens group G5 move (feed out) toward the object side in the same locus. This makes it possible to simplify the mechanical configuration related to zooming.
A part of the lens group of the second c lens group G2c is a vibration-proof lens group that corrects image shake by moving in a direction including an optical axis orthogonal component and displacing the image formation position.
A diaphragm SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (the position immediately before the third lens group G3).

In the numerical embodiment 6 of FIG. 6, the succeeding lens group GR is composed of a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power in this order from the object side (that is,). It has a positive / negative / positive 4-group zoom lens configuration).
When scaling from the short focal length end to the long focal length end, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and so on. The distance between the adjacent lens groups changes so that the distance between the three lens groups G3 and the fourth lens group G4 changes (increases or decreases).
When scaling from the short focal length end to the long focal length end, the first lens group G1 and the fourth lens group G4 are fixed to the image plane, the second lens group G2 moves to the image side, and the second lens group G2 The 3 lens group G3 moves to the image side once and then returns to the object side (U-turns).
The fourth lens group G4 is composed of a fourtha lens group G4a having a positive refractive power, a fourthb lens group G4b having a negative refractive power, and a fourthc lens group G4c having a positive refractive power in order from the object side. ing. The fourth b lens group G4b is an anti-vibration lens group that corrects image shake by moving in a direction including an optical axis orthogonal component and displacing the imaging position.
A diaphragm SP for adjusting the amount of light is provided between the third lens group G3 and the fourth lens group G4 (the position immediately before the fourth lens group G4).

Numerical values in FIGS. 7 and 8 In Examples 7 and 8, the subsequent lens group GR has a positive refractive power of the third lens group G3 and a positive refractive power of the fourth lens group G4 in order from the object side. It is composed of a fifth lens group G5 having an optical power of (that is, a positive / negative positive / negative 5-group zoom lens configuration).
When scaling from the short focal length end to the long focal length end, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and so on. The distance between the adjacent lens groups changes so that the distance between the three lens groups G3 and the fourth lens group G4 decreases and the distance between the fourth lens group G4 and the fifth lens group G5 increases.
When scaling from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed to the image plane, and the second lens group G2 is the image. It moves to the side, and the fourth lens group G4 moves (is extended) to the object side.
The fifth lens group G5 is composed of a fiftha lens group G5a having a positive refractive power, a fifthb lens group G5b having a negative refractive power, and a fifthc lens group G5c having a positive refractive power in order from the object side. ing. The fifth b lens group G5b is an anti-vibration lens group that corrects image shake by moving in a direction including an optical axis orthogonal component and displacing the imaging position.
A diaphragm SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (the position immediately before the third lens group G3).

In the numerical embodiment 9 of FIG. 97, the succeeding lens group GR is composed of a third lens group G3 having a positive refractive power and a fourth lens group G4 having a negative refractive power in this order from the object side (that is,). It has a positive / negative positive / negative 4-group zoom lens configuration).
When scaling from the short focal length end to the long focal length end, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and so on. The distance between the adjacent lens groups changes so that the distance between the three lens groups G3 and the fourth lens group G4 changes (in the example of FIG. 97, it may increase but may decrease).
When scaling from the short focal length end to the long focal length end, the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 move toward the object side with respect to the image plane ( It is paid out).
The fourth lens group G4 is composed of a fourtha lens group G4a having a positive refractive power, a fourthb lens group G4b having a negative refractive power, and a fourthc lens group G4c having a positive refractive power in order from the object side. ing. The fourth b lens group G4b is an anti-vibration lens group that corrects image shake by moving in a direction including an optical axis orthogonal component and displacing the imaging position.
A diaphragm SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (the position immediately before the third lens group G3).

In the numerical embodiment 10 of FIG. 98, the succeeding lens group GR is composed of a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power in this order from the object side (that is,). It has a positive / negative / positive 4-group zoom lens configuration).
When scaling from the short focal length end to the long focal length end, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and so on. The distance between the adjacent lens groups changes so that the distance between the three lens groups G3 and the fourth lens group G4 changes (in the example of FIG. 98, it may increase but may decrease).
When scaling from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, and the fourth lens group G4 move (extend) to the object side with respect to the image plane, and the second lens group G1 is extended. The lens group G2 is fixed to the image plane.
The fourth lens group G4 is composed of a fourtha lens group G4a having a positive refractive power, a fourthb lens group G4b having a negative refractive power, and a fourthc lens group G4c having a positive refractive power in order from the object side. ing. The fourth b lens group G4b is an anti-vibration lens group that corrects image shake by moving in a direction including an optical axis orthogonal component and displacing the imaging position.
A diaphragm SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (the position immediately before the third lens group G3).

In the numerical embodiment 11 of FIG. 99, the subsequent lens group GR is the third lens group G3 having a positive refractive power, the fourth lens group G4 having a positive refractive power, and the third lens group G4 having a negative refractive power in order from the object side. It is composed of a 5-lens group G5 and a 6th lens group G6 having a positive refractive power (a 6-group zoom lens configuration of positive / negative positive / negative positive / negative).
When scaling from the short focal length end to the long focal length end, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and so on. The distance between the 3 lens group G3 and the 4th lens group G4 changes, the distance between the 4th lens group G4 and the 5th lens group G5 changes, and the distance between the 5th lens group G5 and the 6th lens group G6 changes. In addition, the distance between adjacent lens groups changes.
When scaling from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 are relative to the image plane. It moves (is extended) to the object side, and the second lens group G2 is fixed to the image plane. The fourth lens group G4 and the sixth lens group G6 move (feed out) toward the object side in the same trajectory. This makes it possible to simplify the mechanical configuration related to zooming.
The second c lens group G2c is an anti-vibration lens group (first anti-vibration lens group) that corrects image shake by moving in a direction including an optical axis orthogonal component and displacing the imaging position. The fifth lens group G5 is a vibration-proof lens group (second vibration-proof lens group) that corrects image shake by moving in a direction including an optical axis orthogonal component and displacing the image formation position. The second c lens group G2c (first anti-vibration lens group) and the fifth lens group G5 (second anti-vibration lens group) may each function independently as an anti-vibration lens group, or they may be coordinated (coordinated (first anti-vibration lens group). It may be made to function as an anti-vibration lens group. By providing two anti-vibration lens groups and driving them in cooperation (cooperation), it is possible to secure a large anti-vibration angle while suppressing aberration fluctuations during image shake correction. Further, when a plurality of anti-vibration lens groups are provided, it is preferable to satisfy the above-mentioned conditional expressions (20) and (21).

The zoom lens system according to the present embodiment has a four-group zoom configuration shown in Numerical Examples 1 to 8 in FIGS. 1 to 8 and Numerical Examples 9 to 11 in FIGS. 97 to 99. It is not limited to the 5-group zoom configuration and the 6-group zoom configuration. An aspherical surface or a diffractive surface may be used for any surface of the zoom lens system. Examples of the aspherical surface include a glass mold aspherical surface and a ground aspherical surface formed directly on the lens surface, a composite aspherical surface (hybrid aspherical surface) in which a resin layer is applied on the lens surface and an aspherical surface is applied thereto, and a lens. A plastic aspherical lens or the like made of a resin material can be applied.

The zoom lens system according to the present embodiment is a positive lead type in which the focal length on the telescopic side is particularly extended, and the second lens group G2 has a positive refractive power of the second a lens group G2a in order from the object side, and negative lenses. It is composed of a second b lens group G2b having a refractive power and a second c lens group G2c having a negative power. Then, when focusing from infinity to a short distance, the second b lens group G2b moves to the image side, the distance between the second a lens group G2a and the second b lens group G2b, and the second b lens group G2b and the second c lens group. The interval of G2c changes (the second b lens group G2b constitutes the focus lens group). More specifically, the distance between the second a lens group G2a and the second b lens group G2b increases, and the distance between the second b lens group G2b and the second c lens group G2c decreases.

The zoom lens system of the present embodiment has an inverse sign (the second b lens group G2b has a negative refractive power) with respect to the second a lens group G2a arranged adjacent to the object side of the second b lens group G2b which is a focusing lens group. On the other hand, the second a lens group G2a has a positive refractive power) and has a relatively weak refractive power. As a result, it is possible to suppress the scaling effect during focusing and suppress the decrease in the shooting magnification during short-distance shooting.

By arranging the positive second a lens group G2a on the object side of the negative second b lens group G2b, the luminous flux incident on the second b lens group G2b is converged and the lens outer diameter of the second b lens group G2b is reduced. This makes it possible to reduce the weight of the focusing lens group.

Generally, during zooming, especially at the telephoto end (long focal length end), the distance between the first lens group and the second lens group becomes wider, so that the axial luminous flux diameter incident on the second lens group becomes smaller. Therefore, the focusing sensitivity may be lost.

On the other hand, in the zoom lens system of the present embodiment, the positive second a lens group G2a is arranged immediately before the negative second b lens group G2b, which is the focusing lens group, and the second a lens group G2a and the second a lens group G2a are arranged even during zooming. The sensitivity of the focus lens group is maintained by maintaining the distance between the 2b lens group G2b and arranging the seconda lens group G2a and the second b lens group G2b so that they are close to each other even at the telephoto end (long focal length end). I am trying to do it. As a result, it is possible to suppress an increase in the amount of movement of the second b lens group G2b during focusing and an increase in AF time.

Further, a lens group having a positive refractive power (for example, the first lens group G1) arranged on the object side of the second lens group G2 has a relatively weak refractive power. Therefore, even if the distance between the second a lens group G2a and the second b lens group G2b is large during focusing, the scaling effect is relatively small, and it is possible to suppress a decrease in the photographing magnification at a short distance. Although it is possible to use the second a lens group G2a as a focusing lens group, it is not suitable as a group used for high-speed AF because the outer diameter of the lens is relatively large.

The second c lens group G2c is arranged on the image side of the second b lens group G2b. Since the second c lens group G2c having the same refractive power (both negative powers) is on the image side of the second b lens group G2b which is the focus lens group, the second b lens group G2b is given such a strong refractive power. Focusing sensitivity can be obtained without the need for a strong refractive power, so the number of lenses can be relatively small. Further, by arranging the second c lens group G2c, it is possible to suppress the aberration fluctuation due to the change in the shooting distance that occurs during focusing, and it is possible to reduce the weight of the focusing lens group.

Further, by providing the second c lens group G2c, it is possible to give a strong refractive power to the entire second lens group G2, and it is possible to secure the refractive power for scaling from a wide angle to a telephoto lens. Further, the second c lens group G2c is necessary to secure the amount of back focus (distance from the final lens surface to the image surface in the entire lens system) required for the camera system, such as spherical aberration and chromatic aberration correction. It also has a role.

Although it is possible to use the second c lens group G2c as the focusing lens group, in focusing from infinity to a short distance, the second c lens group G2c and the positive third lens group having a relatively strong refractive power with the opposite sign are used. Since the distance from the G3 is widened, the scaling effect is strong, and the reduction in the photographing magnification becomes large at a short distance, which is not preferable.

In the zoom lens system of the present embodiment, the "lens group (for example, the first lens group G1 to the sixth lens group G6)" changes the relative positional relationship in the optical axis direction with the adjacent lens group during zooming, and is spaced back and forth. The "sub-lens group (for example, 2a lens group G2a to 2c lens group G2c, 4a lens group G4a to 4c lens group G4c, 5a lens group G5a to 5c lens group G5c)" is a unit that changes. , Means a unit whose relative positional relationship in the optical axis direction with adjacent lens groups does not change during zooming.

In the second b lens group G2b, which is a focusing lens group, if the distance between the adjacent second a lens group G2a and the second c lens group G2c is changed during zooming, a means controlled by a cam and a means controlled by a motor are used. Can be considered. However, for example, trying to control the second b lens group G2b with a cam is not preferable because the mechanical configuration becomes complicated and the entire lens becomes large. In addition, if the motor controls in synchronization with the zooming operation, it is difficult to sufficiently synchronize due to the delay in electrical control and the speed limit of the motor, and the focus shift occurs during zooming. Not preferable. Therefore, in the present embodiment, the distance between the second a lens group G2a and the second c lens group G2c is fixed during zooming.

In the zoom lens system of the present embodiment, the "vibration-proof lens group" indicates a unit that moves in the direction perpendicular to the optical axis during image blur correction, and is the distance in the optical axis direction from adjacent lens groups during zooming or focusing. There is no limitation as to whether or not it changes. That is, the entire lens group or sub-lens group may be used as the anti-vibration lens group, or a part of the lens group or sub-lens group may be used as the anti-vibration lens group.

In the conditional equations (1) and (1'), the distance between the second b lens group G2b and the second c lens group G2c at the time of focusing at infinity (the secondc lens group G2c from the surface apex on the most image side of the second b lens group G2b). The relationship between the distance on the optical axis to the surface apex on the most object side) and the focal length of the second lens group G2 is defined. By satisfying the conditional expression (1), it is possible to reduce the size of the second lens group G2 and thus the entire lens system, and to satisfactorily correct various aberrations. This action effect can be obtained more remarkably by satisfying the conditional expression (1').
When the upper limits of the conditional expressions (1) and (1') are exceeded, the overall thickness of the second lens group G2 increases, the total length of the lens increases, and the front lens diameter increases in order to secure off-axis light. It ends up.
When the lower limit of the conditional expression (1) is exceeded, the distance between the principal points of the composite optical system of the second b lens group G2b and the second c lens group G2c becomes narrower. Therefore, in order to secure the desired focusing movement amount, the second b lens It is necessary to increase the refractive power of at least one of the group G2b and the second c lens group G2c. Therefore, aberration fluctuations such as spherical aberration, coma aberration, and astigmatism become large during zooming and focusing, and it becomes difficult to correct them.

The conditional expression (2) is the distance between the second b lens group G2b and the second c lens group G2c at the time of focusing at infinity (from the surface apex on the image side of the second b lens group G2b to the object side of the second c lens group G2c The relationship between the distance on the optical axis to the surface apex) and the thickness of the second lens group G2 on the optical axis is defined. By satisfying the conditional expression (2), it is possible to reduce the size of the second lens group G2 and thus the entire lens system, and to satisfactorily correct various aberrations.
If the upper limit of the conditional expression (2) is exceeded, the overall thickness of the second lens group G2 increases, the total length of the lens increases, and the front lens diameter increases in order to secure off-axis light.
When the lower limit of the conditional expression (2) is exceeded, the distance between the principal points of the composite optical system of the second b lens group G2b and the second c lens group G2c becomes narrower. Therefore, in order to secure the desired focusing movement amount, the second b lens It is necessary to increase the refractive power of at least one of the group G2b and the second c lens group G2c. Therefore, aberration fluctuations such as spherical aberration, coma aberration, and astigmatism become large during zooming and focusing, and it becomes difficult to correct them.

In the conditional equations (3) and (3'), when the combined optical system of the second b lens group G2b and the second c lens group G2c is defined as the second bc lens group, the second bc lens group is the second from the most image side surface. It defines the relationship between the distance on the optical axis to the rear principal point position of the 2bc lens group and the focal length of the second bc lens group at the time of infinity focusing. By setting the rear principal point position of the second bc lens group relatively to the object side so as to satisfy the conditional expression (3), the second a lens group G2a having the smallest pupil diameter in the second lens group G2 It is possible to secure the arrangement and the amount of movement of the second b lens group G2b, which is the focusing lens group, without difficulty between the second b lens group G2b and the second b lens group G2b. This action effect can be obtained more remarkably by satisfying the conditional expression (3').
If the upper limit of the conditional expression (3') is exceeded, the overall thickness of the second lens group G2 increases, the total length of the lens increases, and the front lens diameter increases in order to secure off-axis light.
If the lower limit of the conditional expression (3) is exceeded, the position of the posterior principal point of the second bc lens group is too close to the image side, and it becomes difficult to secure the focusing movement amount. If the focusing movement amount is forcibly secured, it is necessary to increase the refractive power of the second b lens group G2b, and the aberration fluctuation at the time of focusing becomes large.

The conditional equations (4) and (4') are the principal point intervals of the second bc lens group on the front side when the synthetic optical system of the second b lens group G2b and the second c lens group G2c is defined as the second bc lens group. It defines the relationship between the distance on the optical axis from the principal point position to the rear principal point position and the focal length of the second bc lens group at the time of infinity focusing. By satisfying the conditional expression (4), an appropriate focusing sensitivity can be obtained without extremely increasing the refractive powers of the second b lens group G2b and the second c lens group G2c. This action effect can be obtained more remarkably by satisfying the conditional expression (4'). Further, by satisfying the conditional expression (4'), it is possible to reduce the size of the second lens group G2 and thus the entire lens system.
If the upper limit of the conditional expression (4') is exceeded, the overall thickness of the second lens group G2 increases, the total length of the lens increases, and the front lens diameter increases in order to secure off-axis light.
If the lower limit of the conditional expression (4) is exceeded, the distance between the principal points of the second bc lens group becomes too narrow, and in order to secure a desired focusing movement amount, at least the second b lens group G2b and the second c lens group G2c It is necessary to strengthen one of the refractive powers. Therefore, aberration fluctuations such as spherical aberration, coma aberration, and astigmatism become large during zooming and focusing, and it becomes difficult to correct them.

In the conditional expressions (5) and (5'), the distance on the optical axis from the surface of the second lens group G2 on the most object side to the position of the front principal point and the thickness on the optical axis of the second lens group G2 It defines the relationship. By satisfying the conditional expression (5), it is possible to reduce the size and weight of the entire lens system and suppress fluctuations in spherical aberration due to the shooting distance at the long focal length end. This action effect can be obtained more remarkably by satisfying the conditional expression (5').
When the upper limits of the conditional expressions (5) and (5') are exceeded, the thickness of the second lens group G2 becomes large, and the outer diameters of the lenses of the first lens group G1 and the second a lens group G2a become large, resulting in the entire lens. It will lead to an increase in the size of the system.
If the lower limit of the conditional expression (5) is exceeded, the second b lens group G2b, which is the focus lens group, becomes closer to the object side and becomes larger, resulting in an increase in the weight of the entire lens system. In particular, at the long focal length end, the fluctuation of spherical aberration due to the shooting distance increases.

In the conditional equations (6) and (6'), when the combined optical system of the second a lens group G2a and the second b lens group G2b is defined as the second ab lens group, the second ab lens group is located on the front side from the most object side surface. The relationship between the distance on the optical axis to the principal point position and the thickness on the optical axis of the second lens group G2 is defined. By satisfying the conditional expression (6), it is possible to reduce the size and weight of the entire lens system and suppress fluctuations in spherical aberration due to the shooting distance at the long focal length end. This action effect can be obtained more remarkably by satisfying the conditional expression (6').
When the upper limit of the conditional expression (6) is exceeded, the thickness of the second lens group G2 becomes large, and the lens outer diameters of the first lens group G1 and the second a lens group G2a become large, resulting in an increase in the size of the entire lens system. I invite you.
If the lower limit of the conditional expression (6) is exceeded, the second b lens group G2b, which is the focus lens group, becomes closer to the object side and becomes larger, resulting in an increase in the weight of the entire lens system. In particular, at the long focal length end, the fluctuation of spherical aberration due to the shooting distance increases.

The second c lens group G2c has at least two negative lenses and at least one positive lens. As a result, it is possible to satisfactorily correct axial chromatic aberration, magnification chromatic aberration, spherical aberration, coma, etc. that change during zooming and focusing while maintaining a certain zoom ratio without increasing the size of the lens. .. The positive lens and the negative lens in the second c lens group G2c may be closely arranged or bonded, or may be arranged with an air gap.

The conditional expressions (7) and (7') define the relationship between the focal length of the second a lens group G2a and the focal length of the second b lens group G2b. By satisfying the conditional expression (7), it is possible to reduce the size of the second b lens group G2b and thus the entire lens system. Further, the weight of the second b lens group G2b, which is a focusing lens group, can be reduced to increase the AF speed. Further, it is possible to satisfactorily correct aberration fluctuations such as spherical aberration, coma, astigmatism, axial chromatic aberration, and Magnification chromatic aberration during focusing. In addition, positive distortion (pincushion distortion) at the telephoto end can be satisfactorily corrected. Further, by appropriately setting the focusing sensitivity, the amount of movement during focusing can be suppressed and the AF speed can be increased. This action effect can be obtained more remarkably by satisfying the conditional expression (7').
If the upper limit of the conditional expression (7) is exceeded, the refractive power of the second a lens group G2a becomes too weak and the light flux diameter incident on the second b lens group G2b becomes large, so that the lens outer diameter of the second b lens group G2b becomes large. It gets bigger. In addition, the weight of the second b lens group G2b, which is the focusing lens group, becomes large, and the AF speed decreases.
When the lower limit of the conditional equation (7) is exceeded, the refractive power of the second a lens group G2a becomes too strong, and aberration fluctuations such as spherical aberration, coma, astigmatism, axial chromatic aberration, and chromatic aberration of magnification during focusing become large. turn into. In addition, positive distortion (pincushion distortion) at the telephoto end increases. Further, since the refractive power of the second b lens group G2b is relatively weakened, it becomes difficult to increase the focusing sensitivity, the amount of movement during focusing increases, and the AF speed decreases.

The conditional expressions (8) and (8') define the relationship between the focal length of the second b lens group G2b and the focal length of the second c lens group G2C. By satisfying the conditional expression (8), the total length of the lens can be shortened, the focusing movement amount of the second b lens group G2b can be suppressed to increase the AF speed, and the aberration fluctuation during focusing can be suppressed. This action effect can be obtained more remarkably by satisfying the conditional expression (8').
If the upper limits of the conditional expressions (8) and (8') are exceeded, the refractive power of the second b lens group G2b becomes too weak, the focusing movement amount increases, and the AF speed decreases. In addition, the total length of the lens becomes large.
If the lower limit of the conditional expression (8) is exceeded, the refractive power of the second b lens group G2b becomes too strong, and the aberration fluctuation during focusing increases.

The conditional equations (9) and (9') show the focal length of the second a lens group G2a and the infinity when the combined optical system of the second b lens group G2b and the second c lens group G2c is defined as the second bc lens group. It defines the relationship with the focal length of the second bc lens group at the time of focusing. By satisfying the conditional equation (9), the focusing sensitivity of the second b lens group G2b is appropriately set to suppress the focusing movement amount, and the aberration fluctuation during focusing (spherical aberration, coma aberration) especially at the long focal length end side. , Astigmatism) can be suppressed. This action effect can be obtained more remarkably by satisfying the conditional expression (9').
If the upper limit of the conditional expression (9) is exceeded, the refractive power of the second a lens group G2a becomes too weak, and the focusing sensitivity of the second b lens group G2b becomes weak, so that the focusing movement amount increases.
When the lower limit of the conditional equation (9) is exceeded, the refractive power of the second a lens group G2a becomes too strong, and aberration fluctuations (spherical aberration, coma aberration, astigmatism) during focusing increase especially on the long focal length end side. Resulting in.

The conditional equations (10) and (10') determine the relationship between the paraxial radius of curvature of the surface of the second a lens group G2a on the most object side and the paraxial radius of curvature of the surface of the second a lens group G2a on the image side. It stipulates. When focusing is performed by the second b lens group G2b, the position (height from the optical axis) of the main ray passing through the second a lens group G2a changes greatly depending on the shooting distance. Therefore, the second a lens group G2a preferably has a shape in which the surface on the object side is convex and the surface on the image side is close to a flat surface so that the change in aberration generated depending on the position of the main light beam is small. When the radius of curvature of the near axis of the surface of the second a lens group G2a on the most image side is positive (convex shape toward the object side), the image plane changes over from infinity to a short distance. When the radius of curvature of the paraxial axis of the surface of the second a lens group G2a on the most image side is negative (convex shape on the image side), the image plane changes to under. By satisfying the conditional expression (10), fluctuations in spherical aberration during focusing can be suppressed. This action effect can be obtained more remarkably by satisfying the conditional expression (10').
If the upper limit of the conditional expression (10) is exceeded, the curvature of the surface of the second a lens group G2a on the most image side becomes too convex and strong toward the image side, and the fluctuation of spherical aberration during focusing becomes remarkable.
When the lower limits of the conditional expressions (10) and (10') are exceeded, the curvature of the surface on the most image side of the second a lens group G2a becomes too strong, and the aberration fluctuation due to the change in the image surface during focusing becomes remarkable. It ends up.

The conditional equations (11), (11'), and (11 ") define the relationship between the radius of curvature of the paraxial radius of the surface of the second a lens group G2a on the most image side and the focal length of the second a lens group G2a. When focusing with the second b lens group G2b, the position (height from the optical axis) of the main ray passing through the second a lens group G2a changes greatly depending on the shooting distance. Therefore, the second a lens group G2a is the main ray. It is preferable that the surface on the object side has a convex surface and the surface on the image side has a shape close to a flat surface so that the change in the aberration generated by the position of the lens group G2a is small. When the radius is positive (convex to the object side), the image plane changes over from infinity to a short distance. The paraxial radius of curvature of the surface closest to the image side of the second a lens group G2a is negative (image side). In the case of a convex shape), the image plane changes to under. By satisfying the conditional equation (11), fluctuations in spherical aberration during focusing can be suppressed. This effect is the conditional equation (11'). ), (11 ″) can be satisfied more prominently.
If the upper limit of the conditional expression (11') is exceeded, the curvature of the surface of the second a lens group G2a on the most image side becomes too convex and strong toward the image side, and the fluctuation of spherical aberration during focusing becomes remarkable.
If the lower limit of the conditional expression (11) is exceeded, the curvature of the surface on the image side of the second a lens group G2a becomes too strong, and the aberration fluctuation due to the change in the image surface during focusing becomes remarkable.

The second a lens group G2a has at least one positive lens and at least one negative lens. This makes it possible to satisfactorily correct aberration fluctuations such as axial chromatic aberration, magnification chromatic aberration, and spherical aberration that occur during focusing. The positive lens and the negative lens in the second a lens group G2a may be closely arranged or joined, or may be arranged with an air gap.

The conditional expressions (12), (12'), and (12 ") define the Abbe number of the positive lens having the largest Abbe number among the positive lenses of the second a lens group. The conditional expression (12) is satisfied. By doing so, it is possible to suppress fluctuations in axial chromatic aberration and lateral chromatic aberration mainly during focusing. This effect can be obtained more prominently by satisfying the conditional expressions (12') and (12 "). Can be done.
If the lower limit of the conditional expression (12) is exceeded, the fluctuations of the axial chromatic aberration and the lateral chromatic aberration during focusing become large.

In the conditional equations (13), (13'), and (13 "), the relationship between the focal length of the negative lens having the largest refractive power among the negative lenses of the second a lens group G2a and the focal length of the second a lens group G2a By satisfying the conditional equation (13), it is possible to suppress fluctuations in spherical aberration, coma aberration, axial chromatic aberration, and lateral chromatic aberration during focusing. This effect is the conditional equation. It can be obtained more prominently by satisfying (13') and (13 ").
When the upper limit of the conditional equation (13') is exceeded, the refractive power of the negative lens included in the second a lens group G2a becomes weak, and it becomes difficult to correct spherical aberration, coma aberration, and axial chromatic aberration mainly on the telephoto side.
When the lower limit of the conditional equation (13) is exceeded, the refractive power of the negative lens included in the second a lens group G2a becomes stronger, and the fluctuations of spherical aberration, coma, axial chromatic aberration, and chromatic aberration of magnification mainly during focusing become large. It ends up.

The conditional expressions (14) and (14') determine the relationship between the paraxial radius of curvature of the surface of the second b lens group G2b on the most object side and the paraxial radius of curvature of the surface of the second b lens group G2b on the image side. It stipulates.
When focusing is performed with the second b lens group G2b, the position and pupil diameter of the main light beam passing through the second b lens group G2b greatly change depending on the shooting distance. Therefore, the second b lens group G2b has a shape in which the curvature is weak on the object side and the surface on the image side is strong so that the change in aberration generated depending on the position of the main ray is small without impairing the focusing sensitivity. preferable.
By satisfying the conditional expression (14), curvature of field, spherical aberration, and coma aberration during focusing can be suppressed. This action effect can be obtained more remarkably by satisfying the conditional expression (14').
When the upper limit of the conditional equation (14) is exceeded, the curvature of the surface of the second b lens group G2b on the most object side becomes too strong with a concave shape on the object side, and curvature of field on the wide-angle side and spherical aberration on the telephoto side during focusing. And the fluctuation of coma aberration becomes large.
When the lower limit of the conditional expression (14) is exceeded, the curvature of the surface of the second b lens group G2b on the most image side becomes too strong with a convex shape toward the image side, and the curvature of field becomes excessive over the entire zoom range. Alternatively, the focusing sensitivity becomes weak and the amount of movement during focusing becomes large.

The second b lens group G2b has a negative lens located closest to the object side. The conditional expressions (15) and (15') define the Abbe number of the negative lens located closest to the object in the second b lens group. By satisfying the conditional expression (15), the chromatic aberration of magnification can be satisfactorily corrected mainly at the long focal length end. This action effect can be obtained more remarkably by satisfying the conditional expression (15').
If the lower limit of the conditional expression (15) is exceeded, the chromatic aberration of magnification will be insufficiently corrected mainly at the long focal length end.

The second b lens group G2b is composed of one negative lens and one positive lens located in order from the object side. As a result, while reducing the weight of the second b lens group G2b, which is the focus lens group, it is possible to satisfactorily correct axial chromatic aberration, Magnification chromatic aberration, spherical aberration, etc. that occur during focusing. The positive lens and the negative lens in the second lens group G2b may be closely arranged or joined, or may be arranged with an air gap.

The conditional expressions (16), (16'), and (16 ") define the relationship between the focal length of the negative lens of the second b lens group G2b and the focal length of the positive lens of the second b lens group G2b. By satisfying the conditional expression (16), the total length of the lens can be shortened, the AF speed can be increased, and fluctuations in spherical aberration and image plane curvature during zooming and focusing can be suppressed. Can be obtained more prominently by satisfying the conditional expressions (16') and (16 ").
If the upper limits of the conditional expressions (16) and (16') are exceeded, the refractive power of the negative lens of the second b lens group G2b becomes too weak, and the focusing sensitivity becomes weak. As a result, the focusing movement amount increases and the AF speed becomes slow. In addition, the total length of the lens becomes large.
If the lower limit of the conditional expression (16) is exceeded, the refractive power of the negative lens of the second b lens group G2b becomes too strong, and the fluctuation of spherical aberration and curvature of field during zooming and focusing becomes large.

The conditional expressions (17) and (17') define the relationship between the Abbe number of the negative lens of the second b lens group G2b and the Abbe number of the positive lens of the second b lens group G2b. By satisfying the conditional expression (17), the axial chromatic aberration generated during focusing can be satisfactorily corrected. This action effect can be obtained more remarkably by satisfying the conditional expression (17').
If the lower limit of the conditional expression (17) is exceeded, the axial chromatic aberration generated during focusing will be insufficiently corrected.

The conditional equations (18), (18'), and (18 ") are the combined focal length from the first lens group G1 to the second b lens group G2b at the time of infinity focusing at the short focal length end, and the short focal length end. Specifies the ratio to the focal length at infinity in focus.
Considering the fluctuation of spherical aberration during focusing, it is desirable that the axial light beam between the second b lens group G2b and the second c lens group G2c sub lens group is as parallel as possible to the optical axis (afocal).
By satisfying the conditional expression (18), it is possible to satisfactorily correct the aberration in the succeeding lens group GR and reduce the fluctuation of the spherical aberration during focusing.
If the upper limits of the conditional expressions (18), (18'), and (18 ") are exceeded, it becomes difficult to maintain the parallelism of the light rays between the second b lens group G2b and the second c lens group G2c, and mainly the wide-angle end. As a result, it becomes difficult to correct the aberration in the subsequent lens group GR, and the spherical aberration fluctuation becomes large especially at the time of focusing.

The conditional expressions (19), (19'), and (19 ") show the lateral magnification of the second b lens group G2b at the long focal length end at infinity focus and the second at infinity focus at the long focal length end. The relationship (focusing sensitivity) with the combined lateral magnification of all the lens groups on the image side of the 2b lens group G2b is defined. By satisfying the conditional expression (19), the focusing sensitivity is appropriately set and lengthened. The shortest shooting distance and the high maximum shooting magnification can be secured. Further, the focusing movement amount can be suppressed to increase the AF speed. Further, the total length of the lens can be shortened. The action effect can be obtained more remarkably by satisfying the conditional equations (19') and (19 ").
If the lower limit of the conditional expression (19) is exceeded, the focusing sensitivity becomes too weak, the shortest shooting distance becomes long, and the maximum shooting magnification decreases. In addition, the focusing movement amount increases and the AF speed becomes slow. In addition, the total length of the lens becomes large.

The zoom lens system of the present embodiment has a vibration-proof lens group that moves from the second b lens group G2b to the image side in a direction including an optical axis orthogonal component to displace the image formation position. With this vibration-proof lens group, it is possible to correct the image shake that occurs in the captured image due to camera shake or the like. When camera shake of the same angle occurs, the longer the focal length, the larger the image blur. Therefore, it is more desirable that the lens with a long focal length on the long focal length side can correct the image blur. However, as the weight of the anti-vibration lens group increases, the size of the anti-vibration lens drive unit for driving the anti-vibration lens group increases. Therefore, the anti-vibration lens group is desired to have a compact and lightweight configuration. In order to capture the brightness (Fno) of the on-axis light and the off-axis light, the lens on the object side of the second b lens group G2b tends to have a larger outer diameter and become heavier. Therefore, by arranging the anti-vibration lens group on the image side of the second b lens group G2b, the weight of the anti-vibration lens group can be reduced.

The anti-vibration lens group has at least one negative lens and at least one positive lens. As a result, aberrations due to eccentricity such as eccentric coma during vibration isolation drive, image plane tilt, and chromatic aberration of magnification can be satisfactorily corrected.

Conditional expression (20) shows the lateral magnification of the anti-vibration lens group at the long focal length end and all the lens groups on the image side of the anti-vibration lens group at the long focal length end. The relationship with the combined lateral magnification (vibration isolation sensitivity) is specified. By satisfying the conditional expression (20), it becomes easy to manufacture (embed) the entire lens system including the anti-vibration lens group, and it becomes easy to obtain the desired anti-vibration performance. Further, the outer diameter of the lens (outer diameter of the lens frame) can be reduced.
If the upper limit of the conditional expression (20) is exceeded, the vibration isolation sensitivity becomes too strong, and it becomes difficult to control the vibration isolation. In addition, eccentric coma during vibration isolation and curvature of the image plane increase, making it difficult to maintain optical performance.
If the lower limit of the conditional expression (20) is exceeded, the anti-vibration sensitivity becomes too weak and the desired anti-vibration performance cannot be obtained. Further, since the number of movable frames in the direction perpendicular to the optical axis of the anti-vibration lens group increases, the outer diameter of the lens (outer diameter of the lens frame) becomes large.

The conditional expressions (21), (21'), and (21 ") define the relationship between the focal length of the second b lens group G2b and the focal length of the anti-vibration lens group. The conditional expression (21) is satisfied. By doing so, it is possible to satisfactorily correct the eccentric aberration during vibration isolation drive and suppress the aberration fluctuation during focusing. This effect is achieved by satisfying the conditional expressions (21') and (21 "). It can be obtained more prominently.
If the upper limit of the conditional expression (21) is exceeded, the refractive power of the anti-vibration lens group becomes too strong, and the eccentric aberration during the anti-vibration drive deteriorates.
If the lower limit of the conditional expression (21) is exceeded, the refractive power of the second b lens group G2b becomes too strong, and the aberration fluctuation during focusing becomes large.

The lens group including the anti-vibration lens group does not have to move in the optical axis direction (may be fixed to the image plane) when scaling from the short focal length end to the long focal length end. The anti-vibration lens drive unit is generally provided with a magnet, a coil, a substrate, or the like in the radial direction (direction perpendicular to the optical axis), and the anti-vibration lens drive unit itself becomes large. When the anti-vibration lens group becomes a group that can move during zooming, it is necessary to provide parts such as a zoom cam cylinder on the outer circumference of the unit, and the outer diameter becomes large. By setting the anti-vibration lens group as a fixed group, a movable frame at the time of zooming becomes unnecessary on the outside of the anti-vibration lens unit, and the outer diameter of the lens can be reduced.

The second lens group G2 does not have to move in the optical axis direction when scaling from the short focal length end to the long focal length end (it may be fixed to the image plane). If the second lens group G2 moves during scaling, it causes an eccentricity error during zooming and causes aberrations such as eccentric coma. By setting the second lens group G2 as a fixed group that does not move at a variable magnification, it is possible to easily suppress the eccentricity error.

The first lens group G1 does not have to move in the optical axis direction when scaling from the short focal length end to the long focal length end (it may be fixed to the image plane). If the first lens group G1 moves during scaling, it causes an eccentricity error during zooming and causes aberrations such as eccentric coma. By setting the first lens group G1 as a fixed group that does not move at a variable magnification, it is possible to easily suppress the eccentricity error.

Conditional expression (22) shows the focal length of the entire system at the long focal length end at infinity focusing, the focal length of the entire system at infinity focusing at the short focal length end, and infinity at the long focal length end. The relationship between the lateral magnification of the second lens group at the time of focusing and the lateral magnification of the second lens group at the time of infinity focusing at the short focal length end is defined. That is, the conditional expression (22) defines the ratio of the variable magnification burden of the second lens group G2 to the zoom ratio. By satisfying the conditional expression (22), spherical aberration, coma aberration, astigmatism variation, and the like during zooming can be satisfactorily corrected.
When the upper limit of the conditional equation (22) is exceeded, the scaling load of the second lens group G2 is reduced, and it is necessary to strengthen the refractive power of the other lens groups in order to obtain a desired scaling ratio. It becomes difficult to correct spherical aberration, coma aberration, astigmatism fluctuation, and the like.
If the lower limit of the conditional expression (22) is exceeded, the scaling load of the second lens group G2 increases, and it becomes difficult to correct spherical aberration, coma aberration, astigmatism variation, etc. during zooming.

The conditional expression (23) defines the relationship between the focal length of the second lens group G2 and the focal length of the entire system at the infinity focusing at the short focal length end. By satisfying the conditional equation (23), it is possible to maintain an appropriate magnification ratio, reduce the size of the entire lens system, and satisfactorily correct spherical aberration, coma aberration, astigmatism, etc. during zooming. it can.
If the upper limit of the conditional expression (23) is exceeded, the refractive power of the second lens group G2 becomes too weak, the magnification ratio decreases, and / or the entire lens system becomes large.
If the lower limit of the conditional expression (23) is exceeded, the refractive power of the second lens group G2 becomes too strong, and it becomes difficult to correct spherical aberration, coma aberration, astigmatism, and the like during zooming.

Conditional expression (24) defines the relationship between the focal length of the first lens group G1 and the focal length of the entire system at infinity focusing at the long focal length end. By satisfying the conditional equation (24), an appropriate magnification ratio is maintained and the entire lens system is miniaturized. Especially on the telephoto side, spherical aberration, coma, astigmatism, axial chromatic aberration, and chromatic aberration of magnification are used. Etc. can be corrected satisfactorily.
If the upper limit of the conditional expression (24) is exceeded, the refractive power of the first lens group G1 becomes too weak, the magnification ratio decreases, and / or the entire lens system becomes large.
If the lower limit of the conditional equation (24) is exceeded, the refractive power of the first lens group G1 becomes too strong, and it is difficult to correct spherical aberration, coma, astigmatism, axial chromatic aberration, chromatic aberration of magnification, etc., especially on the telephoto side. turn into.

Conditional expression (25) shows the focal length of the first lens group G1, the focal length of the entire system at the short focal length end at infinity focusing, and the focal length of the entire system at the long focal length end at infinity focusing. It specifies the ratio to the distance. By satisfying the conditional equation (25), an appropriate magnification ratio is maintained and the entire lens system is miniaturized. Especially on the telephoto side, spherical aberration, coma, astigmatism, axial chromatic aberration, and chromatic aberration of magnification are used. Etc. can be corrected satisfactorily.
If the upper limit of the conditional expression (25) is exceeded, the refractive power of the first lens group G1 becomes too weak, the magnification ratio decreases, and / or the entire lens system becomes large.
If the lower limit of the conditional equation (25) is exceeded, the refractive power of the first lens group G1 becomes too strong, and it is difficult to correct spherical aberration, coma, astigmatism, axial chromatic aberration, chromatic aberration of magnification, etc., especially on the telephoto side. turn into.

In the conditional equation (26), the distance between the first lens group G1 and the second lens group G2 at the time of infinity focusing at the long focal length end (the second lens group G2 from the refractive plane on the most image side of the first lens group G1). Distance on the optical axis to the refracting surface on the most object side of the lens) and the distance between the first lens group G1 and the second lens group G2 at the short focal length end when focusing at infinity (the most image of the first lens group G1). The ratio of the distance on the optical axis from the refracting surface on the side to the refracting surface on the most object side of the second lens group G2) and the focal length of the second lens group G2 is defined. That is, the conditional expression (26) defines the focal length ratio of the second lens group G2 to the amount of interval change during zooming between the first lens group G1 and the second lens group G2. By satisfying the conditional expression (26), it is possible to reduce the size of the entire lens system and suppress various aberration fluctuations during zooming.
If the upper limit of the conditional expression (26) is exceeded, the distance between the first lens group G1 and the second lens group G2 increases on the telephoto side (long focal length end side), so that the entire lens system becomes large.
When the lower limit of the conditional expression (26) is exceeded, the refractive power of at least one of the first lens group G1 and the second lens group G2 must be strengthened in order to obtain a desired magnification ratio, and various types during zooming. Aberration fluctuation becomes large.

In the conditional equation (27), the distance between the second lens group G2 and the succeeding lens group GR at the time of infinity focusing at the short focal length end (from the refractive plane on the most image side of the second lens group G2 to the most of the succeeding lens group GR Distance on the optical axis to the refracting surface on the object side) and the distance between the second lens group G2 and the subsequent lens group GR at the end of the long focal length at infinity (the most image-side refraction of the second lens group G2). The ratio of the distance on the optical axis from the surface to the refracting surface of the subsequent lens group GR on the most object side) and the focal length of the second lens group G2 is defined. That is, the conditional expression (27) defines the focal length ratio of the second lens group G2 to the amount of interval change during zooming between the first lens group G1 and the second lens group G2. By satisfying the conditional expression (27), it is possible to reduce the size of the entire lens system and suppress various aberration fluctuations during zooming.
If the upper limit of the conditional expression (27) is exceeded, the distance between the second lens group G2 and the subsequent lens group GR increases on the telephoto side (long focal length end side), so that the entire lens system becomes large.
When the lower limit of the conditional expression (27) is exceeded, the refractive power of at least one of the second lens group G2 and the succeeding lens group GR must be increased in order to obtain a desired magnification ratio, and various aberrations during zooming must be increased. The fluctuation becomes large.

In the conditional equations (28), (28'), and (28 "), the paraxial curvature radius of the surface of the second a lens group G2a on the most object side and the paraxial curvature of the surface of the second b lens group G2b on the image side are expressed. The ratio to the radius is defined. By satisfying the conditional equation (28), the center of curvature of the surface on the most object side of the second a lens group G2a and the surface on the most image side of the second b lens group G2b are brought closer to each other. , Mainly at the long focal distance end, it becomes possible to satisfactorily suppress the fluctuation of spherical aberration during focusing. This effect can be obtained more remarkably by satisfying the conditional equations (28') and (28 "). be able to.
If the upper limit of the conditional expression (28) is exceeded, the curvature of the surface of the second b lens group G2b on the most image side becomes too strong (tight), and the fluctuation of spherical aberration during focusing becomes remarkable.
If the lower limit of the conditional expression (28) is exceeded, the curvature of the surface of the second a lens group G2a on the most object side becomes too strong (tight), and the fluctuation of spherical aberration during focusing becomes remarkable.

[Numerical Example]
Next, specific numerical examples 1-8 are shown. In the longitudinal aberration diagram and the transverse aberration diagram, and in the table, d-line, g-line, and C-line are aberrations for each wavelength, S is sagittal, M is meridional, FNO. Is F number, Y is image height, and R is curvature. The radius, D is the lens thickness or lens spacing, N (d) is the refractive index for the d line, and ν (d) is the Abbe number for the d line. The back focus is the distance from the image-side surface of the entire lens system to the design image surface. The total length of the lens and the back focus indicate the values of the air-equivalent length between the most image-side surface of the entire lens system and the design image surface, excluding the cover glass and the like. The F-number, focal length, distance between objects, magnification, half angle of view, image height, back focus, total lens length, and lens spacing D, which changes with zooming and focusing, are the short focal length end-intermediate focus. It is shown in the order of distance-long focal length end. The unit of length is [mm].

The rotationally symmetric aspherical surface is defined by the following equation.
x = cy2 / [1 + [1- (1 + K) c2y2] 1/2] + A4y4 + A6y6 + A8y8 + A10y10 + A12y12 ・ ・ ・
(However, c is the curvature (1 / r), y is the height from the optical axis, K is the conical coefficient, A4, A6, A8, ... are the aspherical coefficients of each order)

[Numerical Example 1]
9 to 19 and Tables 1 to 4 show a zoom lens system according to the numerical embodiment 1. FIG. 9 is a lens configuration diagram at infinity focusing at the short focal length end. 10 and 11 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. 12 and 13 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. FIG. 14 is a lateral aberration diagram of FIG. 12 during vibration isolation drive. 15 and 16 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. 17 and 18 are lateral aberration diagrams at the end of the long focal length at in-focus and at 1.2 m in focus. FIG. 19 is a lateral aberration diagram of FIG. 17 during vibration isolation drive (± 0.3 °). Table 1 is surface data, Table 2 is various data, Table 3 is zoom lens group data, and Table 4 is principal point position data.

Numerical value The zoom lens system of Example 1 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. The succeeding lens group GR is composed of a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power in order from the object side. (That is, it has a positive / negative positive / negative / positive 5-group zoom lens configuration).

The first lens group G1 is composed of a positive meniscus lens 11A convex to the object side, a negative meniscus lens 12A convex to the object side, and a positive meniscus lens 13A convex to the object side in order from the object side. The negative meniscus lens 12A and the positive meniscus lens 13A are joined.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
The second a lens group G2a is composed of a biconvex positive lens 21A and a biconcave negative lens 22A in order from the object side. The biconvex positive lens 21A and the biconcave negative lens 22A are joined.
The second b lens group G2b is composed of a biconcave negative lens 23A and a positive meniscus lens 24A convex toward the object side in order from the object side.
The second c lens group G2c is composed of a biconcave negative lens 25A, a biconcave negative lens 26A, and a biconvex positive lens 27A in order from the object side. The biconcave negative lens 26A and the biconvex positive lens 27A are joined.

The third lens group G3 is composed of a biconvex positive lens 31A, a biconvex positive lens 32A, and a negative meniscus lens 33A convex toward the image side in order from the object side. The biconvex positive lens 32A and the negative meniscus lens 33A are joined.

The fourth lens group G4 is composed of a fourtha lens group G4a having a positive refractive power and a fourthb lens group G4b having a negative refractive power in order from the object side.
The fourtha lens group G4a is composed of a biconcave negative lens 41A, a biconvex positive lens 42A, and a biconvex positive lens 43A in order from the object side.
The fourth b lens group G4b is composed of a positive meniscus lens 44A convex to the image side and a biconcave negative lens 45A in order from the object side.

The fifth lens group G5 is composed of a biconvex positive lens 51A, a negative meniscus lens 52A convex on the image side, a negative meniscus lens 53A convex on the image side, and a biconvex positive lens 54A in order from the object side. ing. The biconvex positive lens 51A and the negative meniscus lens 52A are joined.

(Table 1)
Surface data Surface number r DN (d) ν (d)
1 109.489 4.050 1.48749 70.2
2 1346.163 0.200
3 84.450 1.950 1.73800 32.3
4 49.769 9.020 1.49700 81.6
5 1342.515 D5
6 124.201 4.000 1.65160 58.5
7 -186.275 1.340 1.53775 74.7
8 362.228 D8
9 -257.022 1.000 1.65160 58.5
10 22.616 1.400
11 22.808 2.600 1.80518 25.4
12 37.531 D12
13 -154.978 1.000 1.95375 32.3
14 96.030 2.000
15 -95.527 1.200 1.80400 46.5
16 37.706 2.400 1.80810 22.8
17 251.929 D17
18 squeeze INFINITY 2.000
19 62.420 3.930 1.80400 46.5
20 -78.827 0.200
21 45.402 5.260 1.59522 67.7
22 -41.935 1.200 2.00069 25.5
23 -321.928 D23
24-93.217 1.000 1.90366 31.3
25 99.821 1.280
26 66.813 3.040 1.59410 60.5
27 -177.060 0.200
28 58.506 3.000 1.80400 46.5
29 -271.111 2.000
30 -315.044 1.800 1.80518 25.4
31 -48.174 1.200
32 -45.134 0.950 1.77250 49.6
33 45.832 D33
34 92.685 6.560 1.60342 38.0
35 -22.387 1.200 1.91082 35.2
36 -58.706 6.561
37 -26.520 1.150 1.83481 42.7
38 -100.411 0.200
39 346.562 3.900 1.64769 33.8
40 -52.470 D40
41 INFINITY 1.500 1.51633 64.1
42 INFINITY-
(Table 2)
Various data zoom ratio (variable ratio) 4.04
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 4.6 5.1 5.8
Focal length 72.08 135.00 291.30
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 16.7 8.9 4.2
Image height 21.64 21.64 21.64
Back focus 40.44 48.63 60.38
Total lens length 193.39 219.82 240.00
D5 2.950 29.380 49.564
D8 3.000 3.000 3.000
D12 16.460 16.460 16.460
D17 21.941 13.751 2.000
D23 4.659 12.849 24.598
D33 25.146 16.957 5.208
D40 38.453 46.644 58.394
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 4.6 5.1 5.8
Focal length 81.55 139.07 187.68
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.080 -0.148 -0.313
Half angle of view 13.7 7.0 3.2
Image height 21.64 21.64 21.64
Back focus 40.44 48.63 60.38
Total lens length 193.39 219.82 240.00
D5 2.950 29.380 49.564
D8 11.183 12.567 14.750
D12 8.277 5.893 3.710
D17 21.941 13.751 2.000
D23 4.659 12.849 24.598
D33 25.146 16.957 5.208
D40 38.453 46.644 58.394
(Table 3)
Zoom lens group Data group Start surface Focal length
1 1 130.42
2 6 -21.93
3 19 33.51
4 24 -134.61
5 34 1414.94
2a 6 227.71
2b 9 -59.73
2c 13 -35.47
Anti-vibration 30 -62.40
(Table 4)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 5 130.419 0.182 5.194 9.844 1 group
6 17 -21.926 21.421 7.572 7.407 2 groups
18 23 33.505 2.642 4.388 5.560 3 groups
24 33 -134.606 14.365 4.397 -4.292 4 groups
34 40 1414.938 -35.242 5.643 49.170 Group 5 Sub-lens group Start surface End surface Focal length Front principal point principal point spacing Posterior principal point
6 8 227.705 -0.776 2.062 4.054 2a Sub lens group
9 12 -59.732 1.108 1.649 2.242 2b Sub-lens group
13 17 -35.465 1.440 2.155 3.004 2c Sub lens group
6 12 -85.109 10.854 3.294 -0.809 2ab Sub lens group
9 17 -18.367 11.540 7.322 9.198 2bc Sub lens group

[Numerical Example 2]
20 to 30 and Tables 5 to 8 show a zoom lens system according to Numerical Example 2. FIG. 20 is a lens configuration diagram at infinity focusing at the short focal length end. 21 and 22 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. 23 and 24 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. FIG. 25 is a lateral aberration diagram of FIG. 23 during vibration isolation drive. 26 and 27 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. 28 and 29 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. FIG. 30 is a lateral aberration diagram of FIG. 28 during vibration isolation drive (± 0.3 °). Table 5 is surface data, Table 6 is various data, Table 7 is zoom lens group data, and Table 8 is principal point position data.

Numerical value The zoom lens system of Example 2 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. The subsequent lens group GR is composed of a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a negative refractive power in order from the object side. (That is, it has a positive / negative positive / negative 5-group zoom lens configuration).

The first lens group G1 is composed of a biconvex positive lens 11B, a negative meniscus lens 12B convex on the object side, and a positive meniscus lens 13B convex on the object side in order from the object side. The negative meniscus lens 12B and the positive meniscus lens 13B are joined.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
The second a lens group G2a is composed of a negative meniscus lens 21B convex toward the object side and a positive meniscus lens 22B convex toward the object side in order from the object side. The negative meniscus lens 21B and the positive meniscus lens 22B are joined.
The second b lens group G2b is composed of a biconcave negative lens 23B and a positive meniscus lens 24B convex toward the object side in order from the object side.
The second c lens group G2c is composed of a biconcave negative lens 25B, a positive meniscus lens 26B convex on the image side, a biconcave negative lens 27B, and a positive meniscus lens 28B convex on the object side in order from the object side. ing. The positive meniscus lens 26B, the biconcave negative lens 27B, and the positive meniscus lens 28B are joined.

The third lens group G3 is composed of a biconvex positive lens 31B, a biconvex positive lens 32B, and a negative meniscus lens 33B convex toward the image side in order from the object side. The biconvex positive lens 32B and the negative meniscus lens 33B are joined.

The fourth lens group G4 is composed of a fourtha lens group G4a having a positive refractive power and a fourthb lens group G4b having a negative refractive power in order from the object side.
The fourtha lens group G4a is composed of a biconcave negative lens 41B, a biconvex positive lens 42B, and a biconvex positive lens 43B in order from the object side. The biconcave negative lens 41B and the biconvex positive lens 42B are joined.
The fourth b lens group G4b is composed of a biconvex positive lens 44B and a biconcave negative lens 45B in order from the object side.

The fifth lens group G5 is composed of a biconvex positive lens 51B, a negative meniscus lens 52B convex on the image side, and a positive meniscus lens 53B convex on the image side in order from the object side.

(Table 5)
Surface data Surface number r DN (d) ν (d)
1 139.763 4.500 1.48749 70.2
2-4443.525 0.200
3 68.823 1.950 1.85883 30.0
4 49.243 8.400 1.49700 81.6
5 688.357 D5
6 81.370 1.340 1.83481 42.7
7 37.593 6.100 1.59410 60.5
8 858.649 D8
9 -236.261 1.000 1.65160 58.5
10 24.526 1.400
11 24.395 2.600 1.75520 27.5
12 38.249 D12
13 -221.191 1.000 1.91082 35.2
14 122.370 2.000
15 -118.823 3.400 1.62004 36.3
16 -37.301 1.200 1.87070 40.7
17 33.219 2.900 1.89286 20.4
18 288.780 D18
19 Aperture INFINITY 2.000
20 438.709 3.930 1.80400 46.5
21 -56.933 0.200
22 31.295 6.260 1.53775 74.7
23 -45.961 1.200 1.80810 22.8
24 -390.140 D24
25 -73.691 1.000 2.05090 26.9
26 74.990 3.040 1.49700 81.6
27 -81.076 0.200
28 40.313 3.000 1.80610 33.3
29 -193.599 2.000
30 276.350 1.800 1.84666 23.8
31 -54.629 1.200
32 -46.398 0.950 1.77250 49.6
33 38.565 D33
34 134.664 2.900 1.68893 31.1
35 -51.606 3.280
36 -23.022 1.150 1.95375 32.3
37 -135.545 0.200
38 -460.628 2.900 1.56732 42.8
39 -47.532 D39
40 INFINITY 1.500 1.51633 64.1
41 INFINITY-
(Table 6)
Various data zoom ratio (variable ratio) 4.04
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 4.6 5.1 5.9
Focal length 72.08 135.00 291.30
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 16.3 8.8 4.1
Image height 21.64 21.64 21.64
Back focus 45.01 53.61 65.62
Total lens length 196.27 219.60 237.97
D5 2.950 26.251 44.619
D9 3.000 3.000 3.000
D12 16.460 16.460 16.460
D18 22.612 14.011 2.000
D24 4.607 13.208 25.219
D33 26.459 17.858 5.847
D39 43.018 51.619 63.631
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 4.6 5.1 5.9
Focal length 83.46 139.33 182.55
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.082 -0.152 -0.320
Half angle of view 12.9 6.8 3.1
Image height 21.64 21.64 21.64
Back focus 45.01 53.61 65.62
Total lens length 196.27 219.60 237.97
D5 2.950 26.251 44.619
D9 12.486 13.175 14.760
D12 6.975 6.285 4.701
D18 22.612 14.011 2.000
D24 4.607 13.208 25.219
D33 26.459 17.858 5.847
D39 43.018 51.619 63.631
(Table 7)
Zoom lens group Data group Start surface Focal length
1 1 123.06
2 6 -21.14
3 20 33.73
4 25 -149.32
5 34 -318.57
2a 6 309.79
2b 9 -56.84
2c 13 -37.35
Anti-vibration 30 -58.09
(Table 8)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 5 123.058 0.297 5.237 9.515 Group 1
6 18 -21.137 22.336 10.510 9.553 2 groups
19 24 33.729 3.667 4.531 5.392 3 groups
25 33 -149.315 13.384 4.361 -4.555 4 groups
34 39 -318.572 17.050 1.998 -8.618 Group 5 Sub-lens group Start surface End surface Focal length Front principal point Principal point spacing Posterior principal point
6 9 309.788 -2.429 2.920 6.950 2a Sub lens group
9 12 -56.843 1.207 1.606 2.187 2b Sub lens group
13 18 -37.346 2.478 3.838 4.184 2c Sub-lens group
6 12 -72.829 11.865 4.011 -0.436 2ab Sub lens group
9 18 -18.409 11.620 9.315 11.025 2bc Sub lens group

[Numerical Example 3]
31 to 41 and Tables 9 to 12 show a zoom lens system according to the numerical embodiment 3. FIG. 31 is a lens configuration diagram when focusing at infinity at the short focal length end. 32 and 33 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. 34 and 35 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. FIG. 36 is a lateral aberration diagram of FIG. 34 during vibration isolation drive. 37 and 38 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. 39 and 40 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. FIG. 41 is a lateral aberration diagram of FIG. 39 during vibration isolation drive (± 0.3 °). Table 9 is surface data, Table 10 is various data, Table 11 is zoom lens group data, and Table 12 is principal point position data.

Numerical value The zoom lens system of Example 3 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. The subsequent lens group GR is composed of a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a negative refractive power in order from the object side. (That is, it has a positive / negative positive / negative 5-group zoom lens configuration).

The first lens group G1 is composed of a biconvex positive lens 11C, a negative meniscus lens 12C convex on the object side, and a positive meniscus lens 13C convex on the object side in order from the object side. The negative meniscus lens 12C and the positive meniscus lens 13C are joined.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
The second a lens group G2a is composed of a negative meniscus lens 21C that is convex toward the object side and a biconvex positive lens 22C in order from the object side. The negative meniscus lens 21C and the biconvex positive lens 22C are joined.
The second b lens group G2b is composed of a biconcave negative lens 23C and a positive meniscus lens 24C convex toward the object side in order from the object side.
The second c lens group G2c is composed of a biconcave negative lens 25C, a biconcave negative lens 26C, and a positive meniscus lens 27C convex toward the object side in order from the object side. Both concave negative lenses 26C and positive meniscus lens 27C are joined.

The third lens group G3 is composed of a biconvex positive lens 31C, a biconvex positive lens 32C, and a negative meniscus lens 33C convex toward the image side in order from the object side. The biconvex positive lens 32C and the negative meniscus lens 33C are joined.

The fourth lens group G4 is composed of a fourtha lens group G4a having a positive refractive power and a fourthb lens group G4b having a negative refractive power in order from the object side.
The fourtha lens group G4a is composed of a biconcave negative lens 41C, a biconvex positive lens 42C, and a biconvex positive lens 43C in order from the object side.
The fourth b lens group G4b is composed of a positive meniscus lens 44C convex to the image side and a biconcave negative lens 45C in order from the object side.

The fifth lens group G5 is composed of a biconvex positive lens 51C, a negative meniscus lens 52C convex on the image side, a negative meniscus lens 53C convex on the image side, and a biconvex positive lens 54C in order from the object side. ing. The biconvex positive lens 51C and the negative meniscus lens 52C are joined.

(Table 9)
Surface data Surface number r DN (d) ν (d)
1 186.417 4.050 1.48749 70.2
2 -1822.306 0.200
3 95.344 1.950 1.73800 32.3
4 59.003 7.420 1.49700 81.6
5 4141.382 D5
6 98.011 1.340 1.73800 32.3
7 65.395 4.000 1.65160 58.5
8-1355.397 D8
9 -209.666 1.000 1.65160 58.5
10 23.388 1.400
11 23.552 2.600 1.80518 25.4
12 37.887 D12
13 -149.496 1.000 1.95375 32.3
14 108.565 2.000
15 -90.953 1.200 1.80400 46.5
16 40.982 2.400 1.80810 22.8
17 853.949 D17
18 squeeze INFINITY 2.000
19 63.174 3.930 1.80400 46.5
20 -84.994 0.200
21 48.043 5.260 1.59522 67.7
22 -43.499 1.200 2.00069 25.5
23 -376.671 D23
24-110.331 1.000 1.90366 31.3
25 110.962 1.280
26 71.711 3.040 1.59410 60.5
27 -224.850 0.200
28 58.111 3.000 1.80400 46.5
29 -261.671 2.000
30 -279.636 1.800 1.80518 25.4
31 -50.194 1.200
32 -46.652 0.950 1.77250 49.6
33 45.680 D33
34 109.803 6.560 1.60342 38.0
35 -22.102 1.200 1.91082 35.2
36 -56.098 2.515
37 -27.654 1.150 1.83481 42.7
38 -93.015 0.200
39 5565.113 3.900 1.64769 33.8
40 -53.577 D40
41 INFINITY 1.500 1.51633 64.1
42 INFINITY-
(Table 10)
Various data zoom ratio (variable ratio) 4.04
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 4.6 5.1 5.8
Focal length 72.08 135.00 291.30
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 16.5 8.8 4.1
Image height 21.64 21.64 21.64
Back focus 40.25 49.59 62.32
Total lens length 193.46 226.53 252.89
D5 2.950 36.022 62.381
D8 3.000 3.000 3.000
D12 16.460 16.460 16.460
D17 24.079 14.732 2.000
D23 4.659 14.007 26.737
D33 28.918 19.570 6.840
D40 38.256 47.605 60.335
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 4.6 5.1 5.8
Focal length 80.18 138.28 189.66
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.079 -0.148 -0.312
Half angle of view 13.7 7.0 3.2
Image height 21.64 21.64 21.64
Back focus 40.25 49.59 62.32
Total lens length 193.46 226.53 252.89
D5 2.950 36.022 62.381
D8 9.840 11.703 14.414
D12 9.622 6.758 4.046
D17 24.079 14.732 2.000
D23 4.659 14.007 26.737
D33 28.918 19.570 6.840
D40 38.256 47.605 60.335
(Table 11)
Zoom lens group Data group Start surface Focal length
1 1 155.21
2 6 -25.78
3 19 35.50
4 24 -151.03
5 34 -6472.48
2a 6 149.55
2b 9 -57.62
2c 13 -39.60
Anti-vibration 30 -50.36
(Table 12)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 5 155.206 0.910 4.632 8.078 1 group
6 17 -25.779 22.623 6.738 7.039 2 groups
18 23 35.500 2.530 4.398 5.662 3 groups
24 33 -151.031 17.072 4.071 -6.673 4 groups
34 40 -6472.478 -39.590 4.357 50.758 Group 5 Sub-lens group Start surface End surface Focal length Front principal point principal point spacing Posterior principal point
6 8 149.545 0.077 2.143 3.120 2a Sub lens group
9 12 -57.617 1.131 1.650 2.219 2b Sub lens group
13 17 -39.604 1.219 2.134 3.247 2c Sub-lens group
6 12 -101.756 12.882 3.172 -2.714 2ab Sub lens group
9 17 -19.483 10.920 7.164 9.976 2bc Sub lens group

[Numerical Example 4]
42 to 52 and 13 to 16 show a zoom lens system according to the numerical embodiment 4. FIG. 42 is a lens configuration diagram when focusing at infinity at the short focal length end. 43 and 44 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. 45 and 46 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. FIG. 47 is a lateral aberration diagram of FIG. 45 during vibration isolation drive. 48 and 49 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. 50 and 51 are lateral aberration diagrams at the end of the long focal length at in-focus and at 1.2 m in focus. FIG. 52 is a lateral aberration diagram of FIG. 50 during vibration isolation drive (± 0.3 °). Table 13 is surface data, Table 14 is various data, Table 15 is zoom lens group data, and Table 16 is principal point position data.

Numerical value The zoom lens system of Example 4 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. Subsequent lens groups GR are, in order from the object side, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, and negative refraction. It is composed of a sixth lens group G6 of power (that is, a 6-group zoom lens configuration of positive / negative positive / negative / negative).

The first lens group G1 is composed of a plano-convex positive lens 11D convex on the object side, a negative meniscus lens 12D convex on the object side, and a positive meniscus lens 13D convex on the object side in order from the object side. .. The negative meniscus lens 12D and the positive meniscus lens 13D are joined.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
The second a lens group G2a is composed of a biconvex positive lens 21D and a negative meniscus lens 22D convex toward the image side in order from the object side. The biconvex positive lens 21D and the negative meniscus lens 22D are joined.
The second b lens group G2b is composed of a biconcave negative lens 23D and a positive meniscus lens 24D convex toward the object side in order from the object side.
The second c lens group G2c is composed of a biconcave negative lens 25D, a positive meniscus lens 26D convex toward the object side, and a biconcave negative lens 27D in order from the object side. Both concave negative lenses 25D and positive meniscus lens 26D are joined.

The third lens group G3 is composed of a biconvex positive lens 31D, a biconvex positive lens 32D, and a negative meniscus lens 33D convex toward the image side in order from the object side. The biconvex positive lens 32D and the negative meniscus lens 33D are joined.

The fourth lens group G4 is composed of a negative meniscus lens 41D convex toward the object side, a biconvex positive lens 42D, and a positive meniscus lens 43D convex toward the object side in order from the object side. The negative meniscus lens 41D and the biconvex positive lens 42D are joined.

The fifth lens group G5 is composed of a negative meniscus lens 51D that is convex toward the object side.

The sixth lens group G6 is composed of a biconcave negative lens 61D and a biconvex positive lens 62D in order from the object side. The biconcave negative lens 61D and the biconvex positive lens 62D are joined.

(Table 13)
Surface data Surface number r DN (d) ν (d)
1 95.549 5.400 1.48749 70.2
2 INFINITY 0.200
3 93.980 1.950 1.83400 37.2
4 54.009 8.100 1.49700 81.6
5 538.374 D5
6 71.512 5.590 1.51823 59.0
7 -98.080 1.380 1.95375 32.3
8 -194.492 D8
9 -230.444 1.000 1.75500 52.3
10 27.962 1.400
11 26.420 2.400 1.84666 23.8
12 41.166 D12
13 -67.460 1.000 1.78800 47.4
14 38.494 2.900 1.85478 24.8
15 427.561 2.000
16 -83.084 1.000 1.83481 42.7
17 873.197 D17
18 squeeze INFINITY 2.000
19 127.859 2.930 1.80400 46.5
20 -88.194 0.200
21 51.974 5.170 1.49700 81.6
22 -44.897 1.200 1.90366 31.3
23 -162.261 D23
24 81.995 1.200 2.00100 29.1
25 35.316 5.000 1.48749 70.2
26 -133.881 0.200
27 52.803 2.000 1.90043 37.4
28 336.536 D28
29 111.476 1.000 1.66672 48.3
30 30.261 D30
31 -37.239 1.200 1.48749 70.2
32 70.193 5.550 1.76200 40.1
33 -87.277 D33
34 INFINITY 1.500 1.51633 64.1
35 INFINITY-
(Table 14)
Various data zoom ratio (variable ratio) 4.04
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 4.6 5.2 5.7
Focal length 72.08 135.00 291.30
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 17.2 9.0 4.1
Image height 21.64 21.64 21.64
Back focus 35.96 52.45 60.50
Total lens length 193.71 219.79 248.87
D5 2.950 29.033 58.110
D8 2.000 2.000 2.000
D12 12.183 12.183 12.183
D17 26.445 14.029 2.000
D23 20.007 15.936 19.919
D28 5.000 6.860 2.074
D30 27.189 25.329 30.115
D33 33.975 50.463 58.510
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 4.6 5.2 5.7
Focal length 79.46 137.92 206.36
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.077 -0.145 -0.306
Half angle of view 14.5 7.4 3.3
Image height 21.64 21.64 21.64
Back focus 35.96 52.45 60.50
Total lens length 193.71 219.79 248.87
D5 2.950 29.033 58.110
D8 7.578 9.026 11.976
D12 6.605 5.157 2.207
D17 26.445 14.029 2.000
D23 20.007 15.936 19.919
D28 5.000 6.860 2.074
D30 27.189 25.329 30.115
D33 33.975 50.463 58.510
(Table 15)
Zoom lens group Data group Start surface Focal length
1 1 144.43
2 6 -28.06
3 19 46.42
4 24 63.12
5 29 -62.61
6 31 -15551.99
2a 6 130.08
2b 9 -54.78
2c 13 -42.55
Anti-vibration 13 -42.55
(Table 16)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 5 144.428 -0.835 5.465 11.019 1 group
6 17 -28.060 20.760 6.612 5.481 2 groups
18 23 46.415 2.825 3.607 5.068 3 groups
24 28 63.118 4.004 3.161 1.234 4 groups
29 30 -62.608 0.828 0.397 -0.225 5 groups
31 33 -15551.988 -584.947 -20.212 611.909 6-group sub-lens group Start surface End surface Focal length Front principal point Principal point spacing Posterior principal point
6 8 130.079 0.680 2.551 3.739 2a Sub lens group
9 12 -54.776 0.984 1.612 2.205 2b Sub lens group
13 17 -42.553 2.095 2.325 2.480 2c Sub lens group
6 12 -103.898 13.433 3.503 -3.166 2ab Sub lens group
9 17 -20.480 8.917 6.323 8.643 2bc Sub lens group

[Numerical Example 5]
53 to 63 and 17 to 20 show a zoom lens system according to the numerical embodiment 5. FIG. 53 is a lens configuration diagram when focusing at infinity at the short focal length end. 54 and 55 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. 56 and 57 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. FIG. 58 is a lateral aberration diagram of FIG. 56 during vibration isolation drive. 59 and 60 are longitudinal aberration diagrams at the end of the long focal length at in-focus and at 1.2 m in focus. 61 and 62 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. FIG. 63 is a lateral aberration diagram of FIG. 61 during vibration isolation drive (± 0.3 °). Table 17 is surface data, Table 18 is various data, Table 19 is zoom lens group data, and Table 20 is principal point position data.

Numerical value The zoom lens system of Example 5 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. The subsequent lens group GR is composed of a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a negative refractive power in order from the object side. (That is, it has a positive / negative positive / negative 5-group zoom lens configuration).

The first lens group G1 is composed of a plano-convex positive lens 11E convex to the object side, a negative meniscus lens 12E convex to the object side, and a positive meniscus lens 13E convex to the object side in order from the object side. .. The negative meniscus lens 12E and the positive meniscus lens 13E are joined.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
The second a lens group G2a is composed of a biconvex positive lens 21E and a negative meniscus lens 22E convex toward the image side in order from the object side. The biconvex positive lens 21E and the negative meniscus lens 22E are joined.
The second b lens group G2b is composed of a biconcave negative lens 23E and a positive meniscus lens 24E convex toward the object side in order from the object side.
The second c lens group G2c includes a negative meniscus lens 25E convex to the image side, a biconcave negative lens 26E, a positive meniscus lens 27E convex to the object side, and a negative meniscus lens 28E convex to the image side in order from the object side. It is composed of and. Both concave negative lenses 26E and positive meniscus lens 27E are joined.

The third lens group G3 includes a biconvex positive lens 31E, a biconvex positive lens 32E, a biconcave negative lens 33E, a negative meniscus lens 34E convex toward the object side, and a biconvex positive lens 35E in order from the object side. It is composed of a positive meniscus lens 36E that is convex toward the object side. The biconvex positive lens 32E and the biconcave negative lens 33E are joined. The negative meniscus lens 34E and the biconvex positive lens 35E are joined.

The fourth lens group G4 is composed of a biconvex positive lens 41E and a biconcave negative lens 42E in order from the object side. The biconvex positive lens 41E and the biconcave negative lens 42E are joined.

The fifth lens group G5 is composed of a negative meniscus lens 51E convex on the image side.

(Table 17)
Surface data Surface number r DN (d) ν (d)
1 120.884 5.400 1.48749 70.2
2 INFINITY 0.200
3 109.398 1.950 1.73800 32.3
4 58.845 8.100 1.53775 74.7
5 1249.592 D5
6 81.455 5.590 1.59410 60.5
7 -121.229 1.380 1.90366 31.3
8-288.457 D8
9 -322.128 1.000 1.75500 52.3
10 26.652 1.400
11 25.806 2.400 1.84666 23.8
12 42.918 D12
13 -58.813 1.000 1.61997 63.9
14 -296.883 1.300
15 -187.864 1.000 1.80400 46.5
16 24.516 4.100 1.80000 29.9
17 540.867 1.500
18 -70.350 1.000 1.88300 40.8
19 -1156.493 D19
20 aperture INFINITY 2.000
21 513.556 2.930 1.75500 52.3
22 -57.197 0.200
23 34.940 5.170 1.49700 81.6
24-52.550 1.200 1.90366 31.3
25 421.282 21.661
26 118.288 1.200 2.00100 29.1
27 39.474 4.500 1.48749 70.2
28 -86.850 0.200
29 58.198 2.500 1.85883 30.0
30 906.824 D30
31 702.226 2.200 1.80810 22.8
32 -52.353 1.000 1.67270 32.1
33 59.484 D33
34 -25.672 1.200 1.48749 70.2
35 -39.726 D35
36 INFINITY 1.500 1.51633 64.1
37 INFINITY-
(Table 18)
Various data zoom ratio (variable ratio) 4.04
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 4.6 5.2 5.7
Focal length 72.08 135.00 291.29
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 16.9 8.9 4.1
Image height 21.64 21.64 21.64
Back focus 38.53 51.59 59.79
Total lens length 194.98 218.62 250.45
D5 2.950 26.597 58.426
D8 2.000 2.000 2.000
D12 12.709 12.709 12.709
D19 23.262 10.198 2.000
D30 5.059 15.969 1.250
D33 27.189 16.279 30.998
D35 36.538 49.603 57.798
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 4.6 5.3 5.7
Focal length 77.98 132.32 192.60
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.076 -0.144 -0.304
Half angle of view 14.4 7.3 3.2
Image height 21.64 21.64 21.64
Back focus 38.53 51.59 59.79
Total lens length 194.98 218.62 250.45
D5 2.950 26.597 58.426
D8 7.345 8.691 12.004
D12 7.364 6.018 2.705
D19 23.262 10.198 2.000
D30 5.059 15.969 1.250
D33 27.189 16.279 30.998
D35 36.538 49.603 57.798
(Table 19)
Zoom lens group Data group Start surface Focal length
1 1 143.62
2 6 -26.23
3 21 39.27
4 31 -132.72
5 34 -153.14
2a 6 127.44
2b 9 -58.97
2c 13 -36.77
Anti-vibration 15 -55.64
(Table 20)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 5 143.616 0.678 5.462 9.510 1 group
6 19 -26.228 22.635 7.803 5.940 2 groups
20 30 39.267 20.743 -5.053 25.871 3 groups
31 33 -132.722 2.303 1.379 -0.482 4 groups
34 35 -153.143 -1.516 0.370 2.346 Group 5 Sub-lens group Start surface End surface Focal length Front principal point principal point spacing Posterior principal point
6 8 127.435 0.551 2.716 3.703 2a Sub lens group
9 12 -58.971 0.852 1.606 2.342 2b Sub lens group
13 19 -36.777 3.239 3.324 3.338 2c Sub-lens group
6 12 -121.387 14.045 3.627 -3.903 2ab Sub lens group
9 19 -19.018 10.310 7.863 9.236 2bc Sub lens group

[Numerical Example 6]
64 to 74 and Tables 21 to 24 show the zoom lens system according to the numerical embodiment 6. FIG. 64 is a lens configuration diagram when focusing at infinity at the short focal length end. 65 and 66 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. 67 and 68 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. FIG. 69 is a lateral aberration diagram of FIG. 67 during vibration isolation drive. 70 and 71 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. 72 and 73 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. FIG. 74 is a lateral aberration diagram of FIG. 72 during vibration isolation drive (± 0.3 °). Table 21 is surface data, Table 22 is various data, Table 23 is zoom lens group data, and Table 24 is principal point position data.

Numerical value The zoom lens system of Example 6 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. The succeeding lens group GR is composed of a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power in order from the object side (that is, a positive / negative / positive four-group zoom lens configuration). Will be).

The first lens group G1 is composed of a negative meniscus lens 11F that is convex toward the object side, a biconvex positive lens 12F, and a positive meniscus lens 13F that is convex toward the object side in order from the object side.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
The second a lens group G2a is composed of a negative meniscus lens 21F that is convex toward the object side and a positive meniscus lens 22F that is convex toward the object side in order from the object side.
The second b lens group G2b is composed of a biconcave negative lens 23F and a positive meniscus lens 24F convex toward the object side in order from the object side.
The second c lens group G2c is composed of a biconcave negative lens 25F, a biconcave negative lens 26F, and a biconvex positive lens 27F. The biconcave negative lens 26F and the biconvex positive lens 27F are joined.

The third lens group G3 is composed of a biconvex positive lens 31F, a positive meniscus lens 32F convex on the image side, and a negative meniscus lens 33F convex on the image side in order from the object side. The positive meniscus lens 32F and the negative meniscus lens 33F are joined.

The fourth lens group G4 is composed of a fourtha lens group G4a having a positive refractive power, a fourthb lens group G4b having a negative refractive power, and a fourthc lens group G4c having a positive refractive power in order from the object side. ing.
The fourtha lens group G4a includes a negative meniscus lens 41F convex to the object side, a biconvex positive lens 42F, a positive meniscus lens 43F convex to the object side, and a positive meniscus lens 44F convex to the object side in order from the object side. It is composed of a negative meniscus lens 45F that is convex toward the object side and a biconvex positive lens 46F. The negative meniscus lens 41F and the biconvex positive lens 42F are joined. The positive meniscus lens 44F and the negative meniscus lens 45F are joined.
The fourth b lens group G4b is composed of a biconvex positive lens 47F, a biconcave negative lens 48F, and a negative meniscus lens 49F convex toward the image side in order from the object side. The biconvex positive lens 47F and the biconcave negative lens 48F are joined.
The fourthc lens group G4c is composed of a biconvex positive lens 50F, a positive meniscus lens 51F convex on the image side, and a negative meniscus lens 52F convex on the image side in order from the object side. The positive meniscus lens 51F and the negative meniscus lens 52F are joined.

(Table 21)
Surface data Surface number r DN (d) ν (d)
1 211.989 2.710 1.85478 24.8
2 99.937 0.980
3 119.824 7.800 1.49700 81.6
4-1695.428 0.200
5 87.128 8.600 1.72916 54.1
6 1485.614 D6
7 74.974 2.070 1.73800 32.3
8 47.595 2.410
9 64.981 8.700 1.61997 63.9
10 595.830 D10
11 -839.107 1.500 1.78800 47.4
12 34.909 2.000
13 35.588 3.500 1.80810 22.8
14 63.361 D14
15 -95.248 1.320 1.80400 46.6
16 111.987 4.500
17 -64.408 1.370 1.61800 63.4
18 149.839 4.600 2.05090 26.9
19 -157.190 D19
20 301.713 3.080 1.90043 37.4
21 -250.285 0.200
22 -565.980 7.160 1.49700 81.6
23 -46.079 1.530 2.00100 29.1
24-75.606 D24
25 aperture INFINITY 2.400
26 81.830 1.510 1.90366 31.3
27 40.840 7.500 1.49700 81.6
28 -459.366 0.500
29 43.465 4.600 1.85025 30.0
30 81.416 3.620
31 76.442 5.800 1.59410 60.5
32 173.707 1.390 1.90366 31.3
33 53.463 5.990
34 73.105 5.240 1.75500 52.3
35 -158.062 1.800
36 258.881 4.000 1.84666 23.8
37 -114.093 1.230 1.61405 55.0
38 31.643 6.500
39 -59.612 1.140 1.50137 56.4
40 -1064.653 3.600
41 91.538 4.960 1.67003 47.3
42 -118.728 1.580
43 -311.030 6.880 1.64850 53.0
44 -26.359 1.240 2.00100 29.1
45 -91.199 50.757
46 INFINITY 1.500 1.51680 64.2
47 INFINITY-
(Table 22)
Various data zoom ratio (variable ratio) 2.69
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 2.9 2.9 2.9
Focal length 72.08 100.00 194.00
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 16.5 11.9 6.1
Image height 21.64 21.64 21.64
Back focus 52.75 52.75 52.75
Total lens length 258.17 258.17 258.17
D6 1.200 17.662 38.546
D10 2.000 2.000 2.000
D14 16.700 16.700 16.700
D19 40.743 31.979 2.000
D24 9.075 1.370 10.472
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 2.9 2.9 2.9
Focal length 84.38 115.00 179.00
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.084 -0.115 -0.215
Half angle of view 13.1 9.2 4.6
Image height 21.64 21.64 21.64
Back focus 52.75 52.75 52.75
Total lens length 258.17 258.17 258.17
D6 1.200 17.662 38.546
D10 12.164 13.074 15.113
D14 6.536 5.626 3.587
D19 40.743 31.979 2.000
D24 9.075 1.370 10.472
(Table 23)
Zoom lens group Data group Start surface Focal length
1 1 127.16
2 7 -36.87
3 20 125.53
4 26 105.38
2a 6 327.33
2b 9 -76.37
2c 13 -66.08
Anti-vibration 15 -41.25
(Table 24)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 6 127.160 7.591 7.455 5.244 Group 1
7 19 -36.874 24.433 10.644 15.594 2 groups
20 24 125.526 3.790 4.459 3.721 3 groups
25 45 105.382 -7.708 22.230 56.958 Group 4 Sub-lens group Start surface End surface Focal length Front principal point principal point spacing Posterior principal point
7 10 327.330 2.299 4.205 6.676 2a Sub-lens group
11 14 -76.371 1.057 2.327 3.615 2b Sub lens group
15 19 -66.077 -1.240 3.127 9.903 2c Sub-lens group
7 14 -103.631 15.507 6.139 0.534 2ab Sub lens group
11 19 -31.242 10.077 7.707 17.706 2bc Sub-lens group

[Numerical Example 7]
75 to 85 and Tables 25 to 28 show the zoom lens system according to the numerical embodiment 7. FIG. 75 is a lens configuration diagram when focusing at infinity at the short focal length end. 76 and 77 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. 78 and 79 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. FIG. 80 is a lateral aberration diagram of FIG. 78 during vibration isolation drive. 81 and 82 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. 83 and 84 are lateral aberration diagrams at the end of the long focal length at in-focus and at 1.2 m in focus. FIG. 85 is a lateral aberration diagram of FIG. 83 during vibration isolation drive (± 0.3 °). Table 25 is surface data, Table 26 is various data, Table 27 is zoom lens group data, and Table 28 is principal point position data.

Numerical value The zoom lens system of Example 7 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. The subsequent lens group GR is composed of a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, and a fifth lens group G5 having a negative refractive power in order from the object side. (That is, it has a positive / negative positive / negative 5-group zoom lens configuration).

The first lens group G1 is composed of a negative meniscus lens 11G convex to the object side, a biconvex positive lens 12G, and a positive meniscus lens 13G convex to the object side in order from the object side. The negative meniscus lens 11G and the biconvex positive lens 12G are joined.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
The second a lens group G2a is composed of a negative meniscus lens 21G that is convex toward the object side and a biconvex positive lens 22G in order from the object side.
The second b lens group G2b is composed of a biconcave negative lens 23G and a positive meniscus lens 24G convex toward the object side in order from the object side. Both concave negative lenses 23G and positive meniscus lens 24G are joined.
The second c lens group G2c is composed of a biconcave negative lens 25G, a biconcave negative lens 26G, and a biconvex positive lens 27G. The biconcave negative lens 26G and the biconvex positive lens 27G are joined.

The third lens group G3 is composed of a positive meniscus lens 31G convex to the image side, a biconvex positive lens 32G, and a negative meniscus lens 33G convex to the image side in order from the object side. The biconvex positive lens 32G and the negative meniscus lens 33G are joined.

The fourth lens group G4 is composed of a biconvex positive lens 41G, a negative meniscus lens 42G convex toward the object side, and a biconvex positive lens 43G in order from the object side. The negative meniscus lens 42G and the biconvex positive lens 43G are joined.

The fifth lens group G5 is composed of a fiftha lens group G5a having a positive refractive power, a fifthb lens group G5b having a negative refractive power, and a fifthc lens group G5c having a positive refractive power in order from the object side. ing.
The fifth a lens group G5a is composed of a biconvex positive lens 51G, a biconcave negative lens 52G, and a biconvex positive lens 53G in order from the object side. The biconvex positive lens 51G and the biconcave negative lens 52G are joined.
The fifth b lens group G5b is composed of a biconvex positive lens 54G, a biconcave negative lens 55G, and a negative meniscus lens 56G convex toward the image side in order from the object side.
The fifth c lens group G5c is composed of a biconvex positive lens 57G, a positive meniscus lens 58G convex on the image side, and a negative meniscus lens 59G convex on the image side in order from the object side. The positive meniscus lens 58G and the negative meniscus lens 59G are joined.

(Table 25)
Surface data Surface number r DN (d) ν (d)
1 218.592 2.700 1.85478 24.8
2 125.729 10.640 1.49700 81.6
3-278.494 0.200
4 88.406 6.700 1.53775 74.7
5 254.754 D5
6 89.588 2.070 1.73800 32.3
7 48.571 1.300
8 52.655 8.970 1.61800 63.4
9 -312547.760 D9
10 -425.796 1.370 1.76385 48.5
11 33.583 3.900 1.84666 23.8
12 56.336 D12
13 -118.862 1.330 1.74100 52.7
14 123.460 4.500
15 -63.716 1.430 1.72916 54.1
16 79.097 5.960 1.85478 24.8
17 -159.183 D17
18 squeeze INFINITY 2.500
19 -2372.949 4.410 1.90043 37.4
20 -83.332 0.200
21 91.261 9.320 1.49700 81.6
22 -47.098 1.630 2.00100 29.1
23 -258.484 D23
24 72.775 5.380 1.90043 37.4
25 -1116.604 0.200
26 2238.885 1.220 1.91082 35.2
27 52.682 8.590 1.49700 81.6
28 -88.227 D28
29 44.376 7.900 1.49700 81.6
30 -80.836 1.260 1.80440 39.6
31 54.600 3.546
32 85.944 4.300 1.90366 31.3
33 -124.309 1.800
34 100.024 4.980 1.84666 23.8
35 -89.303 0.543
36 -76.657 1.150 1.72000 50.2
37 27.200 6.500
38 -45.000 1.130 1.65160 58.5
39 -88.138 4.223
40 84.857 5.070 1.70154 41.2
41 -166.669 2.000
42 -900.972 8.460 1.65160 58.5
43 -26.886 1.320 2.00100 29.1
44 -448.101 29.621
45 INFINITY 1.500 1.51680 64.2
46 INFINITY-
(Table 26)
Various data zoom ratio (variable ratio) 2.69
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 2.9 2.9 2.9
Focal length 72.08 100.00 194.01
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 16.3 11.7 6.0
Image height 21.64 21.64 21.64
Back focus 31.61 31.61 31.61
Total lens length 249.68 249.68 249.68
D5 1.200 14.150 37.750
D9 2.000 2.000 2.000
D12 16.030 16.030 16.030
D17 38.290 25.341 1.740
D23 18.843 12.389 3.680
D28 3.003 9.457 18.166
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 2.9 2.9 2.9
Focal length 81.37 106.64 148.93
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.083 -0.113 -0.213
Half angle of view 13.0 9.2 4.8
Image height 21.64 21.64 21.64
Back focus 31.61 31.61 31.61
Total lens length 249.68 249.68 249.68
D5 1.200 14.150 37.750
D9 10.850 11.571 13.503
D12 7.180 6.459 4.527
D17 38.290 25.341 1.740
D23 18.843 12.389 3.680
D28 3.003 9.457 18.166
(Table 27)
Zoom lens group Data group Start surface Focal length
1 1 146.21
2 6 -37.54
3 19 102.99
4 24 89.06
5 29 -113.84
2a 6 203.26
2b 9 -69.67
2c 13 -60.65
Anti-vibration 15 -41.25
(Table 28)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 5 146.210 5.484 7.087 7.670 1 group
6 17 -37.540 26.228 10.012 12.620 2 groups
18 23 102.991 0.857 6.376 10.827 3 groups
24 28 89.065 2.539 5.634 7.216 4 groups
29 44 -113.837 55.354 6.600 -7.772 Group 5 Sub-lens group Start surface End surface Focal length Front principal point principal point spacing Posterior principal point
6 9 203.260 2.324 4.279 5.737 2a Sub-lens group
10 12 -69.672 2.887 2.385 -0.002 2b Sub lens group
13 17 -60.651 0.240 3.700 9.280 2c Sub lens group
6 12 -115.167 19.885 5.747 -6.022 2ab Sub lens group
10 17 -28.826 10.619 7.891 16.010 2bc Sub lens group

[Numerical Example 8]
86 to 96 and Tables 29 to 32 show a zoom lens system according to the numerical embodiment 8. FIG. 86 is a lens configuration diagram at infinity focusing at the short focal length end. 87 and 88 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. 89 and 90 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. FIG. 91 is a lateral aberration diagram of FIG. 89 during vibration isolation drive. 92 and 93 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. 94 and 95 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. FIG. 96 is a lateral aberration diagram of FIG. 94 during vibration isolation drive (± 0.3 °). Table 29 is surface data, Table 30 is various data, Table 31 is zoom lens group data, and Table 32 is principal point position data.

Numerical value The zoom lens system of Example 8 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. The subsequent lens group GR is composed of a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, and a fifth lens group G5 having a negative refractive power in order from the object side. (That is, it has a positive / negative positive / negative 5-group zoom lens configuration).

The first lens group G1 is composed of a negative meniscus lens 11H that is convex toward the object side and a biconvex positive lens 12H in order from the object side. The negative meniscus lens 11H and the biconvex positive lens 12H are joined.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
The second a lens group G2a is composed of a positive meniscus lens 21H convex to the object side, a negative meniscus lens 22H convex to the object side, and a positive meniscus lens 23H convex to the object side in order from the object side.
The second b lens group G2b is composed of a biconcave negative lens 24H and a positive meniscus lens 25H convex toward the object side in order from the object side. Both concave negative lenses 24H and positive meniscus lens 25H are joined.
The second c lens group G2c is composed of a biconcave negative lens 26H, a biconcave negative lens 27H, and a positive meniscus lens 28H convex toward the object side. Both concave negative lenses 27H and positive meniscus lens 28H are joined.

The third lens group G3 is composed of a biconvex positive lens 31H, a biconvex positive lens 32H, and a negative meniscus lens 33H convex toward the image side in order from the object side. The biconvex positive lens 32H and the negative meniscus lens 33H are joined.

The fourth lens group G4 is composed of a biconvex positive lens 41H, a biconcave negative lens 42H, and a biconvex positive lens 43H in this order from the object side. The biconcave negative lens 42H and the biconvex positive lens 43H are joined.

The fifth lens group G5 is composed of a fiftha lens group G5a having a positive refractive power, a fifthb lens group G5b having a negative refractive power, and a fifthc lens group G5c having a positive refractive power in order from the object side. ing.
The fifth a lens group G5a is composed of a biconvex positive lens 51H, a biconcave negative lens 52H, and a biconvex positive lens 53H in order from the object side. The biconvex positive lens 51H and the biconcave negative lens 52H are joined.
The fifth b lens group G5b is composed of a biconvex positive lens 54H, a biconcave negative lens 55H, and a negative meniscus lens 56H convex toward the image side in order from the object side. The biconvex positive lens 54H and the biconcave negative lens 55H are joined.
The fifth c lens group G5c is composed of a biconvex positive lens 57H, a biconvex positive lens 58H, and a biconcave negative lens 59H in order from the object side. The biconvex positive lens 58H and the biconcave negative lens 59H are joined.

(Table 29)
Surface data Surface number r DN (d) ν (d)
1 101.460 2.700 1.85883 30.0
2 66.915 13.710 1.59410 60.5
3 -1371.819 D3
4 67.496 4.820 1.48749 70.2
5 92.998 0.500
6 85.477 2.070 1.72047 34.7
7 44.079 1.300
8 47.000 10.660 1.59410 60.5
9 30296.049 D9
10 -504.435 1.370 1.77250 49.6
11 33.000 4.300 1.84666 23.8
12 54.479 D12
13 -152.165 1.330 1.90043 37.4
14 69.197 4.500
15 -95.660 1.430 1.49700 81.6
16 61.219 4.560 2.05090 26.9
17 794.082 D17
18 squeeze INFINITY 2.500
19 450.007 5.610 1.90366 31.3
20 -83.998 0.200
21 115.169 9.320 1.49700 81.6
22 -51.093 1.630 2.00100 29.1
23 -531.092 D23
24 63.003 5.880 1.91082 35.2
25 -1550.091 0.200
26 -6787.793 1.220 1.90366 31.3
27 41.335 9.690 1.53775 74.7
28 -109.863 D28
29 38.816 6.500 1.49700 81.6
30 -94.506 1.260 1.90366 31.3
31 41.448 4.140
32 53.883 5.770 1.90366 31.3
33 -111.107 1.800
34 258.000 3.600 1.84666 23.8
35 -65.396 1.150 1.65160 58.5
36 27.068 7.500
37 -33.923 1.130 1.65160 58.5
38 -55.833 2.600
39 96.283 4.670 1.75520 27.5
40 -61.974 2.000
41 224.495 5.460 1.51633 64.1
42 -30.520 1.320 2.00100 29.1
43 217.587 29.767
44 INFINITY 1.500 1.51680 64.2
45 INFINITY-
(Table 30)
Various data zoom ratio (variable ratio) 2.69
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 2.9 2.9 2.9
Focal length 72.08 100.00 194.00
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 16.4 11.7 6.0
Image height 21.64 21.64 21.64
Back focus 31.76 31.76 31.76
Total lens length 263.38 263.38 263.38
D3 1.200 17.175 42.974
D9 2.000 2.000 2.000
D12 17.000 17.000 17.000
D17 43.514 27.539 1.740
D23 27.812 19.647 2.001
D28 1.700 9.865 27.511
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 2.9 2.9 2.9
Focal length 84.19 110.42 151.76
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.084 -0.115 -0.216
Half angle of view 12.7 8.9 4.6
Image height 21.64 21.64 21.64
Back focus 31.76 31.76 31.76
Total lens length 263.38 263.38 263.38
D3 1.200 17.175 42.974
D9 11.095 12.004 13.942
D12 7.905 6.996 5.058
D17 43.514 27.539 1.740
D23 27.812 19.647 2.001
D28 1.700 9.865 27.511
(Table 31)
Zoom lens group Data group Start surface Focal length
1 1 201.29
2 4 -44.78
3 19 101.01
4 24 91.26
5 29 -140.96
2a 6 146.43
2b 9 -67.50
2c 13 -62.15
Anti-vibration 15 -41.25
(Table 32)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 3 201.293 -0.276 6.322 10.364 Group 1
4 17 -44.781 39.085 8.003 8.752 2 groups
18 23 101.008 -0.089 7.138 12.211 Group 3
24 28 91.258 1.619 6.403 8.968 4 groups
29 43 -140.956 52.991 7.510 -11.601 Group 5 Sub-lens group Start surface End surface Focal length Front principal point principal point spacing Posterior principal point
4 9 146.432 1.991 6.285 11.074 2a Sub lens group
10 12 -67.500 3.132 2.571 -0.033 2b Sub lens group
13 17 -62.153 -0.554 3.330 9.044 2c Sub lens group
4 12 -157.578 39.824 4.669 -17.473 2ab sub-lens group
8 17 -73.194 49.462 -0.404 -1.908 2bc Sub lens group

[Numerical Example 9]
100 to 110 and 33 to 36 show a zoom lens system according to a numerical embodiment 9. FIG. 100 is a lens configuration diagram when focusing at infinity at the short focal length end. FIGS. 101 and 102 are longitudinal aberration diagrams at the end of the short focal length when in focus at infinity and when in focus at 1.2 m. 103 and 104 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. FIG. 105 is a lateral aberration diagram of FIG. 103 during vibration isolation drive. 106 and 107 are longitudinal aberration diagrams at the end of the long focal length when in focus at infinity and when in focus at 1.2 m. FIGS. 108 and 109 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. FIG. 110 is a lateral aberration diagram of FIG. 108 during vibration isolation drive (± 0.3 °). Table 33 is surface data, Table 34 is various data, Table 35 is zoom lens group data, and Table 36 is principal point position data.

Numerical value The zoom lens system of Example 9 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. The subsequent lens group GR is composed of a third lens group G3 having a positive refractive power and a fourth lens group G4 having a negative refractive power in order from the object side (that is, a positive / negative positive / negative four-group zoom lens configuration). Become).

The first lens group G1 is composed of a biconvex positive lens 11I, a negative meniscus lens 12I convex on the object side, and a plano-convex positive lens 13I convex on the object side in order from the object side. The negative meniscus lens 12I and the plano-convex positive lens 13I are joined.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
The second a lens group G2a is composed of a negative meniscus lens 21I that is convex toward the object side and a biconvex positive lens 22I in order from the object side. The negative meniscus lens 21I and the biconvex positive lens 22I are joined.
The second b lens group G2b is composed of a biconcave negative lens 23I and a positive meniscus lens 24I convex toward the object side in order from the object side.
The second c lens group G2c is composed of a biconcave negative lens 25I, a biconvex positive lens 26I, and a negative meniscus lens 27I convex on the image side. The biconcave negative lens 25I and the biconvex positive lens 26I are joined.

The third lens group G3 is composed of a biconvex positive lens 31I, a biconvex positive lens 32I, and a negative meniscus lens 33I convex on the image side in order from the object side. The biconvex positive lens 32I and the negative meniscus lens 33I are joined.

The fourth lens group G4 is composed of a fourtha lens group G4a, a fourthb lens group G4b, and a fourthc lens group C4c in order from the object side.
The fourtha lens group G4a is composed of a biconvex positive lens 41I, a biconcave negative lens 42I, and a biconvex positive lens 43I in order from the object side. The biconvex positive lens 41I and the biconcave negative lens 42I are joined.
The fourth b lens group G4b is composed of a biconvex positive lens 44I and a biconcave negative lens 45I in order from the object side. The biconvex positive lens 44I and the biconcave negative lens 45I are joined.
The fourthc lens group C4c is composed of a biconvex positive lens 46I and a negative meniscus lens 47I convex toward the image side in order from the object side.

(Table 33)
Surface data Surface number r DN (d) ν (d)
1 117.757 4.000 1.48749 70.2
2 -2773.131 0.200
3 103.049 1.500 1.74950 35.3
4 56.571 7.400 1.49700 81.6
5 INFINITY D5
6 68.207 1.200 1.90043 37.4
7 38.000 7.500 1.58313 59.4
8-280.407 D8
9 -209.874 1.200 1.77250 49.6
10 26.762 2.000
11 27.082 2.000 1.84666 23.8
12 45.797 D12
13 -55.344 1.200 1.75500 52.3
14 50.834 3.660 1.85478 24.8
15 -300.000 1.820
16 -43.730 1.200 1.62299 58.2
17 -40130.232 D17
18 squeeze INFINITY 1.000
19 111.055 4.307 1.88300 40.8
20 -80.378 0.200
21 41.051 5.891 1.48749 70.2
22 -47.843 1.200 2.00100 29.1
23 -418.179 D23
24 47.946 5.070 1.59282 68.6
25 -92.822 1.000 1.90366 31.3
26 37.216 0.300
27 32.262 5.943 1.61405 55.0
28 -84.092 5.000
29 635.248 3.000 1.85025 30.0
30 -25.936 1.000 1.80400 46.5
31 41.076 9.946
32 75.873 3.127 1.83481 42.7
33 -194.544 9.066
34 -21.491 1.200 1.73400 51.5
35 -36.089 D35
36 INFINITY 1.500 1.51633 64.1
37 INFINITY-
(Table 34)
Various data zoom ratio (variable ratio) 4.04
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 4.1 5.0 5.8
Focal length 72.08 135.00 291.30
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 16.5 8.8 4.1
Image height 21.64 21.64 21.64
Back focus 47.62 64.39 77.41
Lens total length 186.83 220.27 253.23
D5 2.950 27.582 51.351
D8 2.000 2.000 2.000
D12 16.460 16.460 16.460
D17 21.840 13.521 2.000
D23 3.821 4.188 11.885
D35 45.636 62.401 75.419
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 4.1 5.0 5.8
Focal length 79.24 136.04 193.55
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.078 -0.147 -0.317
Half angle of view 13.5 7.0 3.1
Image height 21.64 21.64 21.64
Back focus 47.62 64.39 77.41
Lens total length 186.83 220.27 253.23
D5 2.950 27.582 51.351
D8 7.968 9.235 11.314
D12 10.492 9.225 7.146
D17 21.840 13.521 2.000
D23 3.821 4.188 11.885
D35 45.636 62.401 75.419
(Table 35)
Zoom lens group Data group Start surface Focal length
1 1 140.18
2 6 -25.29
3 19 43.16
4 24 -31675.66
2a 6 144.20
2b 9 -52.74
2c 13 -42.31
Anti-vibration 29 -61.05
(Table 36)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 5 140.178 0.679 4.414 8.007 1 group
6 17 -25.292 23.165 9.198 7.876 Group 2
18 23 43.165 1.178 4.737 6.683 3 groups
24 35 -31675.664 8206.680 -1673.389 -6488.640 Group 4 Sub-lens group Start surface End surface Focal length Front principal point Principal point spacing Posterior principal point
6 8 144.201 0.857 3.279 4.564 2a Sub lens group
9 12 -52.738 0.188 1.484 3.528 2b Sub lens group
13 17 -42.308 2.307 2.794 2.779 2c Sub-lens group
6 12 -89.774 12.350 4.225 -0.675 2ab Sub lens group
9 17 -19.015 10.208 8.514 10.818 2bc Sub lens group

[Numerical Example 10]
11 to 121 and 37 to 41 show a zoom lens system according to the numerical embodiment 10. FIG. 111 is a lens configuration diagram at infinity focusing at the short focal length end. 112 and 113 are longitudinal aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. 114 and 115 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the short focal length end. FIG. 116 is a lateral aberration diagram of FIG. 114 during vibration isolation drive. 117 and 118 are longitudinal aberration diagrams at the end of the long focal length when in focus at infinity and when in focus at 1.2 m. 119 and 120 are lateral aberration diagrams at infinity focusing and 1.2m focusing at the long focal length end. FIG. 121 is a lateral aberration diagram of FIG. 119 during vibration isolation drive (± 0.3 °). Table 37 is surface data, Table 38 is various data, Table 39 is zoom lens group data, Table 40 is principal point position data, and Table 41 is aspherical data.

Numerical value The zoom lens system of Example 10 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. The succeeding lens group GR is composed of a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power in order from the object side (that is, a positive / negative / positive four-group zoom lens configuration). Will be).

The first lens group G1 is composed of a biconvex positive lens 11J, a negative meniscus lens 12J convex on the object side, and a positive meniscus lens 13J convex on the object side in order from the object side. The negative meniscus lens 12J and the positive meniscus lens 13J are joined.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing.
The second a lens group G2a is composed of a negative meniscus lens 21J that is convex toward the object side and a biconvex positive lens 22J in order from the object side. The negative meniscus lens 21J and the biconvex positive lens 22J are joined.
The second b lens group G2b is composed of a biconcave negative lens 23J and a positive meniscus lens 24J convex toward the object side in order from the object side.
The second c lens group G2c is composed of a biconcave negative lens 25J, a positive meniscus lens 26J convex on the object side, and a negative meniscus lens 27J convex on the image side. Both concave negative lenses 25J and positive meniscus lens 26J are joined.

The third lens group G3 is composed of a biconvex positive lens 31J, a biconvex positive lens 32J, and a negative meniscus lens 33J convex on the image side in order from the object side. The biconvex positive lens 32J and the negative meniscus lens 33J are joined.

The fourth lens group G4 is composed of a fourtha lens group G4a, a fourthb lens group G4b, and a fourthc lens group C4c in order from the object side.
The fourtha lens group G4a is composed of a biconvex positive lens 41J, a biconcave negative lens 42J, and a biconvex positive lens 43J in order from the object side. The biconvex positive lens 41J and the biconcave negative lens 42J are joined. The biconvex positive lens 43J has an aspherical surface on the image side surface.
The fourth b lens group G4b is composed of a biconvex positive lens 44J and a biconcave negative lens 45J in order from the object side. The biconvex positive lens 44J and the biconcave negative lens 45J are joined.
The fourthc lens group C4c is composed of a biconvex positive lens 46J and a negative meniscus lens 47J convex toward the image side in order from the object side.

(Table 37)
Surface data Surface number r DN (d) ν (d)
1 128.481 5.000 1.48749 70.2
2 -775.463 0.200
3 110.744 1.500 1.68376 37.6
4 56.778 7.400 1.49700 81.6
5 644.825 D5
6 89.500 1.200 1.89190 37.1
7 39.000 6.500 1.69680 55.5
8 -368.248 D8
9 -237.670 1.200 1.77250 49.6
10 27.086 2.000
11 28.096 2.000 1.84666 23.8
12 46.990 D12
13 -99.422 1.200 1.61800 63.4
14 41.496 3.100 1.80000 29.9
15 483.673 2.320
16 -46.483 1.200 1.65160 58.5
17 -1336.266 D17
18 squeeze INFINITY 1.000
19 69.313 4.307 1.73400 51.5
20 -98.420 0.200
21 58.658 5.891 1.49700 81.6
22 -48.637 1.200 2.00100 29.1
23 -871.247 D23
24 49.679 4.100 1.51742 52.4
25 -75.433 1.000 1.90043 37.4
26 93.084 1.500
27 56.247 4.500 1.58313 59.4
28 * -68.418 15.173
29 245.133 2.300 1.85478 24.8
30 -40.455 1.000 1.80400 46.5
31 31.872 8.068
32 45.430 4.630 1.57099 50.8
33 -45.816 3.344
34 -25.003 1.200 1.88300 40.8
35 -97.584 D35
36 INFINITY 1.500 1.51633 64.1
37 INFINITY-
* Is a rotationally symmetric aspherical surface.
(Table 38)
Various data zoom ratio (variable ratio) 4.04
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 4.4 5.1 5.8
Focal length 72.10 135.00 291.30
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 16.2 8.6 4.0
Image height 21.64 21.64 21.64
Back focus 38.87 49.31 59.39
Total lens length 188.38 219.10 244.19
D5 2.950 33.664 58.758
D8 2.000 2.000 2.000
D12 16.460 16.460 16.460
D17 29.047 18.583 2.000
D23 4.818 4.845 11.346
D35 36.884 47.322 57.404
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 4.4 5.1 5.8
Focal length 79.58 133.02 172.39
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.079 -0.148 -0.315
Half angle of view 13.1 6.8 3.1
Image height 21.64 21.64 21.64
Back focus 38.87 49.31 59.39
Total lens length 188.38 219.10 244.19
D5 2.950 33.664 58.758
D8 8.833 10.328 12.488
D12 9.627 8.132 5.972
D17 29.047 18.583 2.000
D23 4.818 4.845 11.346
D35 36.884 47.322 57.404
(Table 39)
Zoom lens group Data group Start surface Focal length
1 1 152.30
2 6 -30.84
3 19 55.35
4 24 974.84
2a 6 146.23
2b 9 -52.87
2c 13 -58.09
Anti-vibration 29 -49.23
(Table 40)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 5 152.300 0.356 4.753 8.991 Group 1
6 17 -30.838 21.434 9.076 8.670 2 groups
18 23 55.352 0.030 4.668 7.899 3 groups
24 35 974.841 -515.576 198.711 363.680 Group 4 Sub-lens group Start surface End surface Focal length Front principal point principal point spacing Posterior principal point
6 8 146.234 0.775 3.203 3.722 2a Sub lens group
9 12 -52.873 0.248 1.485 3.466 2b Sub lens group
13 17 -58.092 3.782 2.372 1.665 2c Sub lens group
6 12 -88.474 10.765 4.281 -0.146 2ab Sub lens group
9 17 -22.807 9.556 8.032 11.892 2bc sub-lens group (Table 41)
Aspherical data
NO.28 K = 0.000 A4 = 0.2088E-05 A6 = -0.1121E-08 A8 = 0.000E + 00 A10 = 0.000E + 00 A12 = 0.000E + 00

[Numerical Example 11]
122 to 136 and Tables 42 to 45 show the zoom lens system according to the numerical embodiment 11. FIG. 122 is a lens configuration diagram when focusing at infinity at the short focal length end. 123, 124, and 125 are longitudinal aberration diagrams at infinity focusing, 1.2m focusing, and 0.9m focusing at the short focal length end. 126, 127, and 128 are lateral aberration diagrams at infinity focusing, 1.2m focusing, and 0.9m focusing at the short focal length end. FIG. 129 is a lateral aberration diagram of FIG. 126 during vibration isolation drive. 130, 131, and 132 are longitudinal aberration diagrams at infinity focusing, 1.2m focusing, and 0.9m focusing at the long focal length end. FIGS. 133, 134, and 135 are lateral aberration diagrams at infinity focusing, 1.2m focusing, and 0.9m focusing at the long focal length end. FIG. 136 is a lateral aberration diagram of FIG. 133 during the vibration isolation drive (± 0.6 °) (during the vibration isolation drive of the two vibration isolation lens groups (first and second vibration isolation lens groups)). Table 42 is surface data, Table 43 is various data, Table 44 is zoom lens group data, and Table 45 is principal point position data.

Numerical value The zoom lens system of Example 11 is composed of a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens group GR in this order from the object side. The subsequent lens group GR is, in order from the object side, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, and positive refraction. It is composed of a sixth lens group G6 of power (that is, a 6-group zoom lens configuration of positive / negative positive / negative / positive).

The first lens group G1 is composed of a plano-convex positive lens 11K that is convex toward the object side, a negative meniscus lens 12K that is convex toward the object side, and a positive meniscus lens 13K that is convex toward the object side in order from the object side. .. The negative meniscus lens 12K and the positive meniscus lens 13K are joined.

The second lens group G2 is composed of a second a lens group G2a having a positive refractive power, a second b lens group G2b having a negative refractive power, and a secondc lens group G2c having a negative refractive power in order from the object side. ing. As described above, the second c lens group G2c functions as an anti-vibration lens group (see FIG. 99).
The second a lens group G2a is composed of a negative meniscus lens 21K that is convex toward the object side and a biconvex positive lens 22K in order from the object side. The negative meniscus lens 21K and the biconvex positive lens 22K are joined.
The second b lens group G2b is composed of a biconcave negative lens 23K and a positive meniscus lens 24K convex toward the object side in order from the object side.
The second c lens group G2c is composed of a biconcave negative lens 25K, a positive meniscus lens 26K convex on the object side, and a negative meniscus lens 27K convex on the image side. Both concave negative lenses 25K and positive meniscus lens 26K are joined.

The third lens group G3 is composed of a biconvex positive lens 31K, a biconvex positive lens 32K, and a negative meniscus lens 33K convex on the image side in order from the object side. The biconvex positive lens 32K and the negative meniscus lens 33K are joined.

The fourth lens group G4 is composed of a negative meniscus lens 41K that is convex toward the object side, a biconvex positive lens 42K, and a positive meniscus lens 43K that is convex toward the object side in order from the object side. The negative meniscus lens 41K and the biconvex positive lens 42K are joined.

The fifth lens group G5 is composed of a positive meniscus lens 51K that is convex toward the image side and a biconcave negative lens 52 in order from the object side. The positive meniscus lens 51K and the biconcave negative lens 52 are joined. As described above, the fifth lens group G5 functions as an anti-vibration lens group (see FIG. 99).

The sixth lens group G6 is composed of a biconvex positive lens 61K and a negative meniscus lens 62K convex on the image side in order from the object side.

(Table 42)
Surface data Surface number r DN (d) ν (d)
1 96.809 4.900 1.51823 59.0
2 INFINITY 0.200
3 120.285 1.950 1.65412 39.7
4 52.000 7.500 1.43875 95.0
5 654.604 D5
6 67.375 1.380 1.89190 37.1
7 33.851 7.000 1.69680 55.5
8-497.901 D8
9 -200.377 1.000 1.80400 46.5
10 26.188 1.400
11 26.808 2.400 1.84666 23.8
12 50.000 D12
13 -97.764 1.000 1.72916 54.1
14 38.712 2.900 1.85478 24.8
15 207.147 2.000
16 -60.093 1.000 1.77250 49.6
17 -36895.611 D17
18 squeeze INFINITY 2.000
19 96.048 2.430 1.80400 46.5
20 -128.585 0.200
21 47.142 5.170 1.53775 74.7
22 -58.053 1.200 2.00100 29.1
23 -309.281 D23
24 79.885 1.200 2.00100 29.1
25 30.245 4.400 1.49700 81.6
26 -96.418 0.200
27 47.399 3.000 1.83481 42.7
28 154.412 D28
29 -183.762 2.500 1.85478 24.8
30 -27.067 1.000 1.80400 46.5
31 37.271 D31
32 145.885 3.400 1.80518 25.4
33 -108.356 3.871
34 -37.830 1.200 1.98613 16.5
35 -52.287 D35
36 INFINITY 1.500 1.51633 64.1
37 INFINITY-
(Table 43)
Various data zoom ratio (variable ratio) 4.04
At infinity focus
Short focal length end Intermediate focal length Long focal length end F number 4.5 5.2 5.8
Focal length 72.08 135.00 291.30
Distance between objects INFINITY INFINITY INFINITY
Magnification 0.000 0.000 0.000
Half angle of view 16.6 8.7 4.0
Image height 21.64 21.64 21.64
Back focus 40.62 53.74 60.62
Total lens length 193.29 221.83 254.83
D5 2.950 31.491 64.491
D8 2.000 2.000 2.000
D12 16.460 16.460 16.460
D17 27.294 14.657 2.000
D23 18.502 18.026 23.794
D28 12.000 15.039 13.714
D31 7.062 4.023 5.348
D35 38.634 51.746 58.635
1.2m in focus
Short focal length end Intermediate focal length Long focal length end F number 4.9 5.2 5.7
Focal length 79.15 134.18 187.15
Distance between objects 1200.00 1200.00 1200.00
Magnification -0.077 -0.146 -0.309
Half angle of view 13.2 7.1 3.2
Image height 21.64 21.64 21.64
Back focus 40.62 53.74 60.62
Total lens length 193.29 221.83 254.83
D5 2.950 31.491 64.491
D8 7.355 8.756 11.558
D12 11.105 9.704 6.902
D17 27.294 14.657 2.000
D23 18.502 18.026 23.794
D28 12.000 15.039 13.714
D31 7.062 4.023 5.348
D35 38.634 51.746 58.635
0.9m in focus
Short focal length end Intermediate focal length Long focal length end F number 4.5 5.2 5.7
Focal length 82.31 132.20 158.11
Distance between objects 900.00 900.00 900.00
Magnification -0.114 -0.215 -0.453
Half angle of view 12.6 6.4 2.9
Image height 21.64 21.64 21.64
Back focus 40.62 53.74 60.62
Total lens length 193.29 221.83 254.83
D5 2.950 31.491 64.491
D8 9.851 11.987 16.240
D12 8.609 6.473 2.220
D17 27.294 14.657 2.000
D23 18.502 18.026 23.794
D28 12.000 15.039 13.714
D31 7.062 4.023 5.348
D35 38.634 51.746 58.635
(Table 44)
Zoom lens group Data group Start surface Focal length
1 1 165.24
2 6 -29.44
3 19 46.52
4 24 73.58
5 (vibration isolation 2) 29 -40.81
6 32 160.47
2a 6 112.71
2b 9 -51.49
2c (vibration isolation 1) 13 -46.38
(Table 45)
Cardinal point position data Zoom lens group Start surface End surface Focal length Front principal point Principal interval Rear principal point
1 5 165.242 -1.143 4.826 10.867 Group 1
6 17 -29.440 24.671 7.825 6.044 2 groups
18 23 46.517 2.240 3.546 5.214 3 groups
24 28 73.581 3.399 3.429 1.971 4 groups
29 31 -40.810 1.570 1.611 0.318 5 groups
32 35 160.466 -2.273 2.206 8.538 Group 6 Sub-lens group Start surface End surface Focal length Front principal point principal point spacing Posterior principal point
6 8 112.709 0.295 3.496 4.590 2a Sub lens group
9 12 -51.488 0.466 1.606 2.728 2b Sub lens group
13 17 -46.384 2.794 2.260 1.846 2c Sub-lens group
6 12 -107.136 14.976 4.183 -3.978 2ab Sub lens group
9 17 -19.926 9.909 7.898 10.353 2bc Sub lens group

FIG. 137 is a diagram showing an example of the appearance configuration of the lens barrel (imaging apparatus) LX equipped with the zoom lens system according to the present embodiment. The lens barrel LX is configured as, for example, a zoom interchangeable lens of a single-lens reflex camera. The lens barrel LX includes a fixed cylinder 10, and a lens mount 100 is fixed to the rear side surface of the fixed cylinder 10. On the peripheral surface of the fixed cylinder 10, a zoom ring 11 is fitted in the front region in the optical axis direction, and a focus ring 12 is fitted in the rear region. Rubber rings ZG and FG are fixed to the peripheral surfaces of the zoom ring 11 and the focus ring 12, and the feel during operation is enhanced.

The lens barrel LX can be attached to and detached from the camera body (not shown) by the lens mount 100 provided on the fixed cylinder 10, and the zoom ring 11 can be rotated to move to the long focus (tele) side and the short focus (wide) side. You can zoom. Further, by operating the zoom ring 11 further toward the short focus side while pressing the retractable button B arranged on the peripheral surface, the retracted state in which the length of the lens barrel LX is minimized can be set. Focusing is automatically performed by a built-in motor, but manual focusing is also possible by rotating the focus ring 12.

Inside the fixed cylinder 10, an outer linear motion cylinder 13 and an inner linear motion cylinder (not shown) are coaxially arranged with a required gap in the diameter direction of the cylinder. These linear motion cylinders are integrated with each other at each rear end portion, and by cam engagement between the linear groove in the optical axis direction provided in the fixed cylinder 10 and the cam groove provided in the zoom ring 11. As the zoom ring 11 rotates, it is integrally linearly moved in the optical axis direction inside the fixed cylinder 10.

Although not shown, a helicoid cylinder having a helicoid groove formed on the outer peripheral surface is fitted on the outer circumference of the inner linear motion cylinder. This helicoid cylinder is integrally moved in the tubular axis direction together with the internal linear motion cylinder, but is linked to the zoom ring 11, and is rotated around the tubular axis on the peripheral surface of the internal linear motion cylinder as the zoom ring 11 rotates. It is rotated and moved to. Further, a front linear motion cylinder 16 is fitted between the helicoid cylinder and the external linear motion cylinder 13 in the radial direction. The forward linear motion cylinder 16 is fitted in the helicoid groove of the helicoid cylinder, and is moved in the optical axis direction by the rotation of the helicoid cylinder. The lens L1 is supported on the front end of the front linear motion cylinder 16. The lens L1 depicted in FIG. 137 is, for example, a lens (11A, 11B, 11C, 11D, 11E, 11F, 11G, 11H) located closest to the object side of the first lens group G1 of the zoom lens system of the present embodiment. , 11I, 11J, 11K). Further, the lens barrel LX is provided with a component (for example, an ON / OFF changeover switch for vibration isolation drive) for exerting / assisting the function of the zoom lens system of the present embodiment.

Numerical value The amount of movement of the anti-vibration lens group during the anti-vibration drive (± 0.3 °) of Examples 1 to 10 and the amount of movement of each anti-vibration lens group during the anti-vibration drive (± 0.3 °) of Numerical Example 11 Is shown in Table 46. The unit of this movement amount is millimeter [mm].
(Table 46)
Short focal length end Intermediate focal length Long focal length end Example 1 ± 0.246 ± 0.457 ± 0.973
Example 2 ± 0.264 ± 0.494 ± 1.078
Example 3 ± 0.239 ± 0.448 ± 0.964
Example 4 ± 0.272 ± 0.359 ± 0.561
Example 5 ± 0.344 ± 0.444 ± 0.730
Example 6 ± 0.254 ± 0.353 ± 0.685
Example 7 ± 0.299 ± 0.415 ± 0.804
Example 8 ± 0.291 ± 0.404 ± 0.784
Example 9 ± 0.322 ± 0.481 ± 0.896
Example 10 ± 0.327 ± 0.509 ± 0.944
Example 11
G2C ± 0.285 ± 0.372 ± 0.571
G5 ± 0.292 ± 0.454 ± 0.874

Numerical values Table 47 shows the values for each conditional expression of Examples 1 to 11.
(Table 47)
Example 1 Example 2 Example 3 Example 4
Conditional expression (1) 0.751 0.779 0.638 0.434
Conditional expression (2) 0.452 0.388 0.452 0.371
Conditional expression (3) 0.501 0.599 0.512 0.422
Conditional expression (4) 0.399 0.506 0.368 0.309
Conditional expression (5) 0.588 0.527 0.622 0.632
Conditional expression (6) 0.298 0.280 0.354 0.409
Conditional expression (7) 3.812 5.450 2.596 2.375
Conditional expression (8) 1.684 1.522 1.455 1.287
Conditional expression (9) 12.398 16.828 7.676 6.351
Conditional expression (10) 0.489 0.827 1.156 2.163
Conditional expression (11) 1.591 2.772 9.063 1.495
Conditional expression (12) 58.5 60.5 58.5 59.0
Conditional expression (13) 1.004 0.274 1.812 1.606
Conditional expression (14) 1.342 1.386 1.441 1.435
Conditional expression (15) 58.5 58.5 58.5 52.3
Conditional expression (16) 0.476 0.413 0.451 0.407
Conditional expression (17) 33.1 31.0 33.1 28.5
Conditional expression (18) 0.141 0.208 0.135 0.063
Conditional expression (19) -8.203 -8.233 -8.336 -9.409
Conditional expression (20) 1.568 1.415 1.572 2.719
Conditional expression (21) 1.153 0.979 1.144 1.287
Conditional expression (22) 1.503 1.532 1.540 1.312
Conditional expression (23) 0.304 0.293 0.358 0.389
Conditional expression (24) 0.448 0.422 0.533 0.496
Conditional expression (25) 0.900 0.849 1.071 0.997
Conditional expression (26) 2.126 1.971 2.305 1.966
Conditional expression (27) 0.909 0.975 0.856 0.871
Conditional expression (28) 3.309 2.127 2.587 1.737
Example 5 Example 6 Example 7 Example 8
Conditional expression (1) 0.485 0.453 0.427 0.380
Conditional expression (2) 0.349 0.330 0.328 0.304
Conditional expression (3) 0.486 0.567 0.555 0.558
Conditional expression (4) 0.413 0.247 0.274 0.270
Conditional expression (5) 0.622 0.482 0.537 0.700
Conditional expression (6) 0.386 0.306 0.407 0.713
Conditional expression (7) 2.161 4.286 2.917 2.169
Conditional expression (8) 1.603 1.156 1.149 1.086
Conditional expression (9) 6.701 10.477 7.051 5.098
Conditional expression (10) 1.787 0.776 1.001 0.996
Conditional expression (11) 2.264 1.820 1537.675 206.895
Conditional expression (12) 60.5 63.9 63.4 70.2
Conditional expression (13) 1.823 0.557 0.723 0.881
Conditional expression (14) 1.307 1.163 1.305 1.242
Conditional expression (15) 52.3 47.4 48.5 49.6
Conditional expression (16) 0.453 0.447 0.447 0.442
Conditional expression (17) 28.5 24.6 24.7 25.8
Conditional expression (18) 0.018 0.009 0.010 0.017
Conditional expression (19) -9.398 -3.346 -3.724 -3.611
Conditional expression (20) 2.090 1.482 1.263 1.298
Conditional expression (21) 1.060 1.715 1.689 1.735
Conditional expression (22) 1.318 1.000 1.354 1.629
Conditional expression (23) 0.364 0.512 0.521 0.621
Conditional expression (24) 0.493 0.655 0.754 1.038
Conditional expression (25) 0.991 1.075 1.236 1.702
Conditional expression (26) 2.115 1.013 0.974 0.933
Conditional expression (27) 0.811 1.051 0.974 0.933
Conditional expression (28) 1.898 1.183 1.590 1.239
Example 9 Example 10 Example 11
Conditional expression (1) 0.651 0.534 0.559
Conditional expression (2) 0.409 0.420 0.427
Conditional expression (3) 0.569 0.521 0.520
Conditional expression (4) 0.448 0.352 0.396
Conditional expression (5) 0.576 0.547 0.640
Conditional expression (6) 0.307 0.275 0.389
Conditional expression (7) 2.734 2.766 2.189
Conditional expression (8) 1.247 0.910 1.110
Conditional expression (9) 7.584 6.412 5.656
Conditional expression (10) 1.643 1.642 1.313
Conditional expression (11) 1.945 2.518 4.418
Conditional expression (12) 59.370 55.530 55.530
Conditional expression (13) 0.674 0.536 0.690
Conditional expression (14) 1.558 1.493 1.665
Conditional expression (15) 49.600 49.600 46.530
Conditional expression (16) 0.411 0.399 0.441
Conditional expression (17) 25.820 25.820 22.750
Conditional expression (18) 0.155 0.220 0.119
Conditional expression (19) -10.188 -8.975 -9.721
Conditional expression (20) 1.702 1.616 2.673 (G2c standard) 1.742 (G5 standard)
Conditional expression (21) 0.864 1.074 1.110 (G2c standard) 1.262 (G5 standard)
Conditional expression (22) 1.618 1.481 1.488
Conditional expression (23) 0.351 0.428 0.408
Conditional expression (24) 0.481 0.523 0.567
Conditional expression (25) 0.967 1.051 1.140
Conditional expression (26) 1.914 1.810 2.090
Conditional expression (27) 0.784 0.877 0.859
Conditional expression (28) 1.489 1.905 1.348

As is clear from Table 47, the numerical examples 1 to 11 satisfy the conditional expressions (1) to (28), and as is clear from the longitudinal aberration diagram and the transverse aberration diagram, the various aberrations are relatively good. It has been corrected. In addition, despite the small number of focusing lenses, aberration fluctuations due to changes in the shooting distance are suppressed at both the short focal length end and the long focal length end, and aberration fluctuations during anti-vibration drive are well corrected. ing.

Even if a lens or lens group having no substantial power is added to the zoom lens system included in the claims of the present invention, it is included in the technical scope of the present invention (the technical scope of the present invention is included in the scope of the present invention). It does not mean that it was avoided).

G1 1st lens group with positive refractive power G2 2nd lens group with negative refractive power G2a 2nd lens group with positive refractive power G2b 2nd lens group with negative refractive power (focus lens group)
G2c 2c lens group with negative refractive power (anti-vibration lens group)
GR Subsequent lens group G3 Positive refractive power 3rd lens group G4 Positive refractive power 4th lens group, negative refractive power 4th lens group G4a Positive refractive power 4th lens group G4b Negative refractive power 4th b lens group (anti-vibration lens group)
G4c 4c lens group with positive power G5 5th lens group with positive power, 5th lens group with negative power G5a 5a lens group with positive power G5b 5b lens group with negative power (Vibration isolation lens group)
G5c 5c lens group with positive refractive power G6 6th lens group with positive refractive power, 6th lens group with negative refractive power CG parallel plane plate SP aperture

Claims (20)

From the object side, it is composed of a first lens group with a positive refractive power, a second lens group with a negative refractive power, and a subsequent lens group.
When scaling from the short focal length end to the long focal length end, the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the subsequent lens group decreases.
The second lens group is composed of a second a lens group having a positive refractive power, a second b lens group having a negative refractive power, and a secondc lens group having a negative refractive power in order from the object side.
When focusing from infinity to a short distance, the 2b lens group moves to the image side, and the distance between the 2a lens group and the 2b lens group and the distance between the 2b lens group and the 2c lens group change.
A zoom lens system that is characterized by this. When the synthetic optical system of the second a lens group and the second b lens group is defined as the second ab lens group, and the synthetic optical system of the second b lens group and the second c lens group is defined as the second bc lens group,
The zoom lens system according to claim 1, wherein at least one of the following conditional expressions (1), (2), (3), (4), (5), and (6) is satisfied.
(1) 0.3 <D2bc / (-f2) <1.0
(2) 0.3 <D2bc / D2 <1.0
(3) 0.3 <H2_2bc / (-f2bc)
(4) 0.2 <HH_2bc / (-f2bc)
(5) 0 <H1-2 / D2 <0.9
(6) 0 <H1-2ab / D2 <1.0
However,
D2bc: Distance between the 2b lens group and the 2c lens group at infinity focusing,
f2: Focal length of the second lens group,
D2: Thickness on the optical axis of the second lens group,
H2_2bc: The distance on the optical axis from the most image-side surface of the second bc lens group to the posterior principal point position of the second bc lens group.
f2bc: Focal length of the second bc lens group at infinity focus,
HH_2bc: Distance on the optical axis from the front principal point position to the posterior principal point position, which is the distance between the principal points of the second bc lens group.
H1-2: Distance on the optical axis from the most object-side surface of the second lens group to the front principal point position,
H1-2ab: The distance on the optical axis from the surface on the most object side of the second ab lens group to the position of the principal point on the front side. The zoom lens system according to claim 1 or 2, wherein the second c lens group has at least two negative lenses and at least one positive lens. The zoom lens system according to any one of claims 1 to 3, wherein the zoom lens system satisfies the following conditional expression (7).
(7) 1.5 <f2a / (-f2b) <6.5
However,
f2a: Focal length of the 2nd a lens group,
f2b: Focal length of the 2nd b lens group. The zoom lens system according to any one of claims 1 to 4, wherein the zoom lens system satisfies the following conditional expression (8).
(8) 0.5 <f2b / f2c <2.5
However,
f2b: Focal length of the 2nd b lens group,
f2c: Focal length of the 2nd lens group. A method according to any one of claims 1 to 5, wherein when the synthetic optical system of the second b lens group and the second c lens group is defined as the second bc lens group, the following conditional expression (9) is satisfied. The zoom lens system described.
(9) 4 <f2a / (-f2bc) <20
However,
f2a: Focal length of the 2nd a lens group,
f2bc: Focal length of the second bc lens group when focusing at infinity. The zoom lens system according to any one of claims 1 to 6, wherein the zoom lens system satisfies the following conditional expression (10).
(10) 0.4 <(R2_2a-R1_2a) / (R2_2a + R1_2a) <3.0
However,
R1-2a: Paraxial radius of curvature of the surface closest to the object in the second a lens group,
R2_2a: The radius of curvature of the paraxial axis of the surface on the image side of the second a lens group. The zoom lens system according to any one of claims 1 to 7, wherein the zoom lens system satisfies the following conditional expression (11).
(11) 0.40 << R2_2a | / f2a
However,
R2_2a: Paraxial radius of curvature of the surface closest to the image side of the 2nd a lens group,
f2a: Focal length of the 2nd a lens group. The zoom lens system according to any one of claims 1 to 8, wherein the second a lens group has at least one positive lens and satisfies the following conditional expression (12).
(12) 45 <2apMAX_νd
However,
2apMAX_νd: The Abbe number of the positive lens having the largest Abbe number among the positive lenses of the second a lens group. The zoom lens system according to any one of claims 1 to 9, wherein the second a lens group has at least one negative lens. The zoom lens system according to any one of claims 1 to 10, wherein the second a lens group has at least one negative lens and satisfies the following conditional expression (13).
(13) 0.2 <(-f2anMAX) / f2a
However,
f2anMAX: Focal length of the negative lens with the largest refractive power among the negative lenses in the 2nd a lens group.
f2a: Focal length of the 2nd a lens group. The zoom lens system according to any one of claims 1 to 11, wherein the zoom lens system satisfies the following conditional expression (14).
(14) 0.4 <(R1_2b-R2_2b) / (R1-2b + R2_2b) <2.5
However,
R1-2b: Paraxial radius of curvature of the surface of the second b lens group on the most object side,
R2_2b: The radius of curvature of the paraxial axis of the surface on the image side of the second b lens group. The zoom lens according to any one of claims 1 to 12, wherein the second b lens group has a negative lens located closest to the object side and satisfies the following conditional expression (15). system.
(15) 30 <2bn_νd
However,
2bn_νd: Abbe number of the negative lens located closest to the object in the 2b lens group. The zoom lens system according to any one of claims 1 to 13, wherein the second b lens group is composed of one negative lens and one positive lens located in order from the object side. The zoom lens system according to claim 14, wherein the zoom lens system satisfies the following conditional expression (16).
(16) 0.1 <(-f2bn) /f2bp <0.7
However,
f2bn: Focal length of the negative lens of the 2nd b lens group,
f2bp: Focal length of the positive lens of the 2nd b lens group. The zoom lens system according to claim 14 or 15, wherein the zoom lens system satisfies the following conditional expression (17).
(17) 20 <2bn_νd-2bp_νd
However,
2bn_νd: Abbe number of negative lenses in the 2nd b lens group,
2bp_νd: Abbe number of positive lenses in the 2nd b lens group. The zoom lens system according to any one of claims 1 to 16, wherein the zoom lens system satisfies the following conditional expression (18).
(18) fW / | f1-2bW | <0.5
However,
fW: Focal length of the entire system at infinity focusing at the short focal length end,
f1-2bW: Combined focal length from the first lens group to the second b lens group at infinity focusing at the short focal length end. The zoom lens system according to any one of claims 1 to 17, wherein the zoom lens system satisfies the following conditional expression (19).
(19) (1-M_2bt ² ) · M_2bRt ² <-3.0
However,
M_2bt: Lateral magnification of the 2b lens group at infinity focusing at the long focal length end,
M_2bRt: Synthetic lateral magnification of all lens groups on the image side of the 2b lens group at infinity focusing at the long focal length end. From the object side, it is composed of a first lens group with a positive refractive power, a second lens group with a negative refractive power, and a subsequent lens group.
When scaling from the short focal length end to the long focal length end, the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the subsequent lens group decreases.
The second lens group is composed of a second a lens group having a positive refractive power, a second b lens group having a negative refractive power, and a secondc lens group having a negative refractive power in order from the object side.
When focusing from infinity to a short distance, the 2b lens group moves to the image side, and the distance between the 2a lens group and the 2b lens group and the distance between the 2b lens group and the 2c lens group change.
A lens barrel equipped with a zoom lens system that is characterized by this. From the object side, it is composed of a first lens group with a positive refractive power, a second lens group with a negative refractive power, and a subsequent lens group.
When scaling from the short focal length end to the long focal length end, the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the subsequent lens group decreases.
The second lens group is composed of a second a lens group having a positive refractive power, a second b lens group having a negative refractive power, and a secondc lens group having a negative refractive power in order from the object side.
When focusing from infinity to a short distance, the 2b lens group moves to the image side, and the distance between the 2a lens group and the 2b lens group and the distance between the 2b lens group and the 2c lens group change.
An image pickup device equipped with a zoom lens system.

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