JP6705638B2 - Zoom lens and image pickup apparatus including the same - Google Patents

Description

The present invention relates to a zoom lens and an image pickup apparatus including the same.

A camera using an electronic image pickup device such as a digital camera has been reduced in size, weight and cost. In order to further advance these, it is necessary to further miniaturize the body and the optical system.

Also, the optical system has, for example, two imaging needs. The first need for photography is the need to photograph large buildings and the need to take commemorative photographs against a vast background. The second need for photography is the need to perform photography from a wide range to magnified photography of a subject with one photography lens.

In order to meet the first shooting need, it is necessary to widen the angle of view of the optical system. In order to satisfy the second shooting need, it is necessary to increase the zoom ratio of the optical system. An optical system that satisfies the two shooting needs is, for example, a zoom lens having a half angle of view of 40 degrees or more and a zoom ratio of 6 times or more. A zoom lens with such specifications can be used in various shooting scenes, so it can be said to be an easy-to-use zoom lens.

Patent Documents 1, 2 and 3 disclose a zoom lens including five lens groups. These zoom lenses include, in order from the object side, a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power, and a negative refracting power. It is composed of a fourth lens group having a power and a fifth lens group having a positive refractive power.

JP, 2003-255228, A Japanese Patent Laid-Open No. 2009-283983 JP-A-8-190051

In a zoom lens, the outer diameter of the optical system becomes larger as the angle of view becomes wider and the zoom ratio becomes larger, and the total length of the optical system tends to become longer. Therefore, if an attempt is made to widen the angle of view and increase the zoom ratio, the optical system becomes large. As a result, the size of the camera also increases, which deteriorates portability and mobility. Further, in a lens interchangeable type camera, portability and mobility of the zoom lens itself deteriorate.

In order to downsize the optical system while ensuring a wide angle of view and a large zoom ratio, it is particularly effective to increase the F number on the telephoto side. For example, by setting the F-number on the telephoto side to 5.6 or more, the outer diameter of the optical system can be reduced.

Further, since the diameter of the light beam on the telephoto side becomes small, the amount of aberration generated decreases. Each lens of the optical system is given a role of correcting aberrations and a role of achieving predetermined specifications. When the amount of aberration generated decreases, the burden ratio in the role of correcting aberration decreases. Therefore, the reduced amount can be used for achieving desired specifications, for example, for downsizing the optical system. As described above, by increasing the F number on the telephoto side, it is possible to reduce the size of the optical system while ensuring a wide angle of view and a large zoom ratio.

However, if the F-number on the telephoto side is increased, the light beam becomes thinner, and the optical image becomes darker. Therefore, if the F-number on the telephoto side is increased, the occurrence of camera shake and subject shake increases. In this case, it is likely that a photographer cannot take a photograph as intended, or that a photo opportunity is missed. Further, in order not to miss a photo opportunity, it is also important to increase the AF speed and the shake correction speed.

The zoom lens of Patent Document 1 has a small zoom ratio and a long overall length with respect to the focal length. The zoom lens of Patent Document 2 has a large F number on the telephoto side. The zoom lens of Patent Document 3 has a narrow angle of view and a long overall length with respect to the focal length.

The present invention has been made in view of the above problems, and has a small zoom lens having a wide angle of view and a large zoom ratio, and aberration is favorably corrected, and an image pickup including the same. The purpose is to provide a device. It is another object of the present invention to provide a zoom lens having a small F number and causing less camera shake during shooting at the telephoto end, and an image pickup apparatus including the zoom lens.

In order to solve the above-mentioned problems and achieve the object, the zoom lens of the present invention is
From the object side,
A first lens group having a positive focal length,
A second lens group having a negative focal length,
A third lens group having a positive focal length,
A fourth lens group having a negative focal length,
It consists of a fifth lens group with a positive focal length,
At the time of zooming from the wide-angle end to the telephoto end, the air distance between the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group changes from each other,
The second lens group is composed of a plurality of lenses,
A configuration including a positive lens, a positive lens, and a cemented lens in order from the object side is included in the third lens group, and the cemented lens includes, in order from the object side, a negative lens and a positive lens,
The fifth lens group consists of one negative lens and one positive lens,
It is characterized in that the following conditional expressions (1 ′ ) and (2) are satisfied.
-8.3 ≤ f1G/f2G ≤ -6.5 (1 ' )
22≦ν22n−ν21n≦60 (2)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
ν21n is the Abbe's number at the d-line of the lens having the negative focal length arranged closest to the object in the second lens group,
ν22n is the Abbe's number at the d-line of the second lens having the negative focal length, which is arranged second from the object side of the second lens group with the air gap therebetween,
Is.
Further, another zoom lens of the present invention is
From the object side,
A first lens group having a positive focal length,
A second lens group having a negative focal length,
A third lens group having a positive focal length,
A fourth lens group having a negative focal length,
It consists of a fifth lens group with a positive focal length,
At the time of zooming from the wide-angle end to the telephoto end, the air distance between the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group changes from each other,
The second lens group is composed of a plurality of lenses,
A configuration including a positive lens, a positive lens, and a cemented lens in order from the object side is included in the third lens group, and the cemented lens includes, in order from the object side, a negative lens and a positive lens,
The fifth lens group consists of one negative lens and one positive lens,
It is characterized in that the following conditional expressions (1), (2) and (8) are satisfied.
−8.5≦f1G/f2G≦−6.5 (1)
22≦ν22n−ν21n≦60 (2)
0.85≦f1G/fT≦1.65 (8)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
ν21n is the Abbe's number at the d-line of the lens having the negative focal length arranged closest to the object in the second lens group,
ν22n is the Abbe's number at the d-line of the second lens having the negative focal length, which is arranged second from the object side of the second lens group with the air gap therebetween,
fT is the focal length of the entire zoom lens system at the telephoto end,
Is.
Further, another zoom lens of the present invention is
From the object side,
A first lens group having a positive focal length,
A second lens group having a negative focal length,
A third lens group having a positive focal length,
A fourth lens group having a negative focal length,
It consists of a fifth lens group with a positive focal length,
At the time of zooming from the wide-angle end to the telephoto end, the air distance between the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group changes from each other,
The second lens group is composed of a plurality of lenses,
A configuration including a positive lens, a positive lens, and a cemented lens in order from the object side is included in the third lens group, and the cemented lens includes, in order from the object side, a negative lens and a positive lens,
The fifth lens group consists of one negative lens and one positive lens,
It is characterized in that the following conditional expressions (1), (2), and (9) are satisfied.
−8.5≦f1G/f2G≦−6.5 (1)
22≦ν22n−ν21n≦60 (2)
0.2≦fG2F/fG2≦1.35 (9)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
ν21n is the Abbe's number at the d-line of the lens having the negative focal length arranged closest to the object in the second lens group,
ν22n is the Abbe's number at the d-line of the second lens having the negative focal length, which is arranged second from the object side of the second lens group with the air gap therebetween,
fG2F is the focal length of the lens arranged closest to the object in the second lens group,
Is.
Further, another zoom lens of the present invention is
From the object side,
A first lens group having a positive focal length,
A second lens group having a negative focal length,
A third lens group having a positive focal length,
A fourth lens group having a negative focal length,
It consists of a fifth lens group with a positive focal length,
At the time of zooming from the wide-angle end to the telephoto end, the air distance between the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group changes from each other,
The second lens group is composed of a plurality of lenses,
A configuration including a positive lens, a positive lens, and a cemented lens in order from the object side is included in the third lens group, and the cemented lens includes, in order from the object side, a negative lens and a positive lens,
The fifth lens group consists of one negative lens and one positive lens,
It is characterized in that the following conditional expressions (1), (2) and (18) are satisfied.
−8.5≦f1G/f2G≦−6.5 (1)
22≦ν22n−ν21n≦60 (2)
0.2≦f3G/fT≦0.33 (18)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
ν21n is the Abbe's number at the d-line of the lens having the negative focal length arranged closest to the object in the second lens group,
ν22n is the Abbe's number at the d-line of the second lens having the negative focal length, which is arranged second from the object side of the second lens group with the air gap therebetween,
f3G is the focal length of the third lens group,
fT is the focal length of the entire zoom lens system at the telephoto end,
Is.

In addition, the imaging device of the present invention,
With the above zoom lens,
And an image pickup device for converting an image formed by the zoom lens into an electric signal.

According to the present invention, it is possible to provide a zoom lens that has a wide angle of view and a large zoom ratio and that is satisfactorily corrected for aberrations, and an image pickup apparatus including the same, which is small in size. Further, it is possible to provide a zoom lens having a small F number and causing less camera shake during shooting at the telephoto end, and an image pickup apparatus including the zoom lens.

FIG. 3 is a lens cross-sectional view of the zoom lens according to Example 1 when an object at infinity is in focus. FIG. 9 is a lens cross-sectional view of the zoom lens according to Example 2 when an object at infinity is in focus. FIG. 6 is a lens cross-sectional view of a zoom lens according to Example 3 when an object at infinity is in focus. FIG. 9 is a lens cross-sectional view of the zoom lens according to Example 4 when focusing on an object at infinity. FIG. 9 is a lens cross-sectional view of a zoom lens according to Example 5 when focusing on an object at infinity. FIG. 13 is a lens cross-sectional view of the zoom lens according to Example 6 upon focusing on an object at infinity. FIG. 16 is a lens cross-sectional view of the zoom lens according to Example 7 when focusing on an object at infinity. FIG. 19 is a lens cross-sectional view of the zoom lens according to Example 8 upon focusing on an object at infinity. FIG. 16 is a lens cross-sectional view of the zoom lens according to Example 9 upon focusing on an object at infinity. FIG. 19 is a lens cross-sectional view of the zoom lens according to Example 10 upon focusing on an object at infinity. FIG. 16 is a lens cross-sectional view of the zoom lens according to Example 11 upon focusing on an object at infinity. FIG. 13 is a lens cross-sectional view of the zoom lens according to Example 12 upon focusing on an object at infinity. FIG. 19 is a lens cross-sectional view of the zoom lens according to Example 13 upon focusing on an object at infinity. FIG. 19 is a lens cross-sectional view of the zoom lens according to Example 14 upon focusing on an object at infinity. FIG. 16 is a lens cross-sectional view of the zoom lens according to Example 15 upon focusing on an object at infinity. FIG. 16 is a lens cross-sectional view of the zoom lens according to Example 16 upon focusing on an object at infinity. FIG. 19 is a lens cross-sectional view of the zoom lens according to Example 17 upon focusing on an object at infinity. FIG. 19 is a lens cross-sectional view of the zoom lens according to Example 18 upon focusing on an object at infinity. FIG. 20 is a lens cross-sectional view of the zoom lens according to Example 19 upon focusing on an object at infinity. FIG. 6 is an aberration diagram of the zoom lens of Example 1 upon focusing on an object at infinity. FIG. 6 is an aberration diagram of the zoom lens of Example 2 upon focusing on an object at infinity. FIG. 7 is an aberration diagram of a zoom lens of Example 3 upon focusing on an object at infinity. FIG. 7 is an aberration diagram of the zoom lens of Example 4 upon focusing on an object at infinity. FIG. 13 is an aberration diagram of the zoom lens of Example 5 upon focusing on an object at infinity. FIG. 16 is an aberration diagram of the zoom lens of Example 6 upon focusing on an object at infinity. FIG. 19 is an aberration diagram of the zoom lens of Example 7 upon focusing on an object at infinity. FIG. 16 is an aberration diagram of the zoom lens of Example 8 upon focusing on an object at infinity. FIG. 10 is an aberration diagram of a zoom lens according to Example 9 when focusing on an object at infinity. FIG. 13 is an aberration diagram of a zoom lens according to example 10 upon focusing on an object at infinity. FIG. 16 is an aberration diagram of the zoom lens of Example 11 upon focusing on an object at infinity. FIG. 13 is an aberration diagram of a zoom lens of Example 12 when focusing on an object at infinity. FIG. 19 is an aberration diagram of the zoom lens of Example 13 upon focusing on an object at infinity. FIG. 19 is an aberration diagram of the zoom lens of Example 14 upon focusing on an object at infinity. 19 is an aberration diagram of a zoom lens of Example 15 upon focusing on an object at infinity. FIG. FIG. 19 is an aberration diagram at the time of focusing on an object at infinity of the zoom lens according to example 16; FIG. 19 is an aberration diagram at the time of focusing on an object at infinity of the zoom lens according to example 17; FIG. 19 is an aberration diagram of the zoom lens of Example 18 upon focusing on an object at infinity. FIG. 19 is an aberration diagram at the time of focusing on an object at infinity of the zoom lens according to example 19; It is sectional drawing of an imaging device. It is a front perspective view of an imaging device. It is a rear perspective view of an imaging device. 3 is a configuration block diagram of an internal circuit of a main part of the image pickup apparatus.

Prior to the description of the examples, the operation and effect of the embodiment according to an aspect of the present invention will be described. In addition, when concretely explaining the operation and effect of the present embodiment, a concrete example will be shown. However, as in the case of the examples described below, those exemplified modes are merely a part of the modes included in the present invention, and there are many variations in the modes. Therefore, the present invention is not limited to the illustrated embodiments.

The zoom lens according to the present embodiment includes, in order from the object side, a first lens group having a positive focal length, a second lens group having a negative focal length, a third lens group having a positive focal length, and a negative lens group. And a fifth lens group having a positive focal length, the second lens group is composed of a plurality of lenses, and the following conditional expressions (1) and (2) Is satisfied.
−8.5≦f1G/f2G≦−6.5 (1)
22≦ν22n−ν21n≦60 (2)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
ν21n is the Abbe's number at the d-line of the lens having the negative focal length arranged closest to the object in the second lens group,
ν22n is the Abbe's number at the d-line of the second lens having the negative focal length, which is arranged second from the object side of the second lens group with the air gap therebetween,
Is.

In the zoom lens according to the present embodiment, the refractive powers are arranged in order from the object side: the positive refractive power, the negative refractive power, the positive refractive power, the negative refractive power, and the positive refractive power. As a result, the arrangement of the refractive powers is symmetrical between the object side and the image side with the third lens group as the center.

With such a configuration, it is possible to secure a wide angle of view at the wide-angle end, a large zoom ratio, and a small F-number at the telephoto end. For example, an angle of view of 80 degrees or more can be secured at the wide-angle end, and a zoom ratio of 5 times or more can be secured.

Also, by providing such a configuration, it is possible to shorten the overall length of the optical system and reduce the diameter, and further, in the entire zoom range, various aberrations, particularly off-axis aberrations at the wide-angle end and axial at the telephoto end, are achieved. The upper aberration can be corrected well.

Further, in the optical system, the diameter of the first lens group is the maximum. As described above, since the fourth lens group has a negative focal length and the fifth lens group has a positive focal length, the fourth lens group and the fifth lens group form a magnifying optical system. can do. As a result, the diameter of the first lens group can be reduced. As a result, downsizing of the entire optical system can be achieved.

In the zoom lens according to the present embodiment, the second lens group includes a plurality of lenses and satisfies the conditional expressions (1) and (2).

Conditional expression (1) represents the ratio of the focal length of the first lens group and the focal length of the second lens group. By satisfying conditional expression (1), a compact and high-performance zoom lens can be obtained.

If the upper limit of conditional expression (1) is not exceeded, the focal length of the first lens group can be reduced. As a result, the total length of the optical system can be shortened.

If the lower limit value of conditional expression (1) is not exceeded, the occurrence of various aberrations in the second lens group can be reduced. As a result, a zoom lens with good imaging performance can be obtained.

Conditional expression (2) represents the relationship of Abbe numbers of the lenses arranged in the second lens group.

For example, assume that the second lens group includes a lens LA, a lens LB, and a lens LC in order from the object side. When the three lenses are arranged apart from each other, the lens LB corresponds to the lens arranged second from the object side with an air gap therebetween. In addition, when the lens LA and the lens LB are cemented, the lens LC corresponds to the lens that is arranged second from the object side with an air gap therebetween.

The second lens group is one of the main lens groups responsible for zooming. In order to achieve high zooming while shortening the overall length of the optical system, it is necessary to reduce the focal length of the second lens group and increase zooming efficiency. However, when the focal length of the second lens group is made small, it becomes difficult to satisfactorily correct coma, field curvature and lateral chromatic aberration mainly at the wide-angle end.

Therefore, in the zoom lens according to the present embodiment, a glass material having a high refractive index (generally, a glass material having a high refractive index has a small Abbe number) is used for the lens arranged closest to the object in the second lens group. By doing so, the coma aberration and the field curvature are favorably corrected while reducing the focal length of the second lens group.

Further, a glass material having a large Abbe number is used for the lens arranged second from the object side of the second lens group with an air gap therebetween. By doing so, the chromatic aberration of magnification is effectively corrected.

By satisfying the conditional expression (2), it is possible to obtain a small-sized zoom lens having high zoom ratio and high performance. “High zoom ratio” means “large zoom ratio”.

If the upper limit of conditional expression (2) is not exceeded, the focal length of the second lens group can be reduced. This makes it possible to favorably correct coma and field curvature while reducing the overall length of the optical system.

If the lower limit value of conditional expression (2) is not exceeded, lateral chromatic aberration at the wide-angle end can be effectively corrected. As a result, a high-performance zoom lens can be obtained.

In the zoom lens according to the present embodiment, during zooming from the wide-angle end to the telephoto end, the air gap between the first lens group and the second lens group widens, and the air gap between the second lens group and the third lens group narrows. It is preferable that the air gap between the third lens group and the fourth lens group be wide, and the air gap between the fourth lens group and the fifth lens group be wide.

By doing so, zooming can be performed in each lens group without demagnification, and high zooming efficiency can be obtained.

The zoom lens of the present embodiment preferably satisfies the following conditional expression (3).
50≦νdG2N (3)
However,
νdG2N is the maximum Abbe number in the d-line of the negative lens arranged in the second lens group,
Is.

Conditional expression (3) represents the condition of the maximum Abbe number among the Abbe numbers on the d-line of the negative lens arranged in the second lens group. By satisfying conditional expression (3), it is possible to favorably correct lateral chromatic aberration at the wide-angle end and axial chromatic aberration at the telephoto end.

The zoom lens of the present embodiment preferably satisfies the following conditional expression (4).
1.85≦ndG2P (4)
However,
ndG2P is the maximum refractive index of the positive lenses arranged in the second lens group at the d-line,
Is.

Conditional expression (4) represents the condition of the maximum refractive index among the refractive indices at the d-line of the positive lens arranged in the second lens group. By satisfying conditional expression (4), it is possible to reduce the fluctuation of the field curvature and the fluctuation of the spherical aberration in the entire zoom range. As a result, it is possible to obtain a zoom lens having good imaging performance.

The zoom lens of the present embodiment preferably satisfies the following conditional expressions (5) and (6).
55≦νdG2L2N (5)
ndG2L2N≦1.65 (6)
However,
νdG2L2N is the Abbe's number at the d-line of the lens having the negative focal length that is arranged second from the object side of the second lens group with an air gap in between,
ndG2L2N is a refractive index at the d-line of a lens having a negative focal length, which is arranged second from the object side of the second lens group with an air gap therebetween,
Is.

Conditional expressions (5) and (6) are defined as d of a lens having a negative focal length which is arranged second from the object side of the second lens group with an air gap therebetween (hereinafter, referred to as “second negative lens”). The line represents the Abbe number condition.

In the second negative lens, it is necessary to use a glass material having a large Abbe number in order to correct chromatic aberration. In order to correct the chromatic aberration even better, it is preferable to use a glass material having a lower refractive index as the glass material used for the second negative lens. However, if the refractive index of the glass material used for the second negative lens is too low, the diameter of the second lens group becomes large. As a result, it becomes difficult to achieve miniaturization of the optical system.

The second lens group has a negative focal length. Therefore, a glass material having a large Abbe number is used as the glass material of the negative lens in the second lens group. By doing so, it is possible to excellently correct chromatic aberration.

By satisfying conditional expressions (5) and (6), it is possible to obtain a zoom lens in which lateral chromatic aberration at the wide-angle end is favorably corrected.

For example, assume that the second lens group includes, in order from the object side, a negative lens La, a positive lens Lb, a negative lens Lc, and a negative lens Ld. When the four lenses are arranged apart from each other, the negative lens Lc corresponds to the second negative lens. When the negative lens La, the positive lens Lb, and the negative lens Lc are cemented, the negative lens Ld corresponds to the second negative lens.

The zoom lens of the present embodiment preferably satisfies the following conditional expression (7).
0.6≦(β2W/β3W)/(β2T/β3T)≦1.7 (7)
However,
β2W is the lateral magnification of the second lens group at the wide-angle end,
β3W is the lateral magnification of the third lens group at the wide-angle end,
β2T is the lateral magnification of the second lens group at the telephoto end,
β3T is the lateral magnification of the third lens group at the telephoto end,
Is.

Conditional expression (7) represents the relationship between the lateral magnification of the second lens group and the lateral magnification of the third lens group at the wide-angle end and the telephoto end. By satisfying conditional expression (7), a small zoom lens can be obtained.

By not exceeding the upper limit value of the conditional expression (7), it is possible to reduce the load ratio of the zooming action of the third lens group. This makes it possible to reduce the driving amount of the third lens unit during zooming. Therefore, it is possible to obtain a zoom lens having a short optical system.

Other than the third lens group, the second lens group mainly bears the zooming effect. By not lowering the lower limit value of the conditional expression (7), it is possible to reduce the load ratio of the zooming action of the second lens group. This makes it possible to reduce the height of off-axis rays that pass through the second lens group at the wide-angle end. As a result, the diameter of the second lens group can be reduced. Furthermore, since the diameter of the first lens group located closer to the object side than the second lens group is also smaller, a compact zoom lens can be obtained.

The zoom lens of the present embodiment preferably satisfies the following conditional expression (8).
0.85≦f1G/fT≦1.65 (8)
However,
f1G is the focal length of the first lens group,
fT is the focal length of the entire zoom lens system at the telephoto end,
Is.

Conditional expression (8) represents the ratio between the focal length of the first lens group and the focal length of the entire zoom lens system at the telephoto end. By satisfying the conditional expression (8), it is possible to obtain the zoom lens in which the total length of the optical system can be shortened and the lateral chromatic aberration at the telephoto end is reduced.

If the upper limit of conditional expression (8) is not exceeded, the focal length of the first lens group can be reduced. As a result, the total length of the optical system can be shortened.

If the lower limit value of conditional expression (8) is not exceeded, the focal length of the first lens group becomes large. In this case, it is possible to reduce the chromatic aberration of magnification that occurs in the first lens group, especially the chromatic aberration of magnification at the telephoto end.

The zoom lens according to the present embodiment preferably satisfies the following conditional expression (9).
0.2≦fG2F/fG2≦1.35 (9)
However,
fG2F is the focal length of the lens arranged closest to the object in the second lens group,
fG2 is the focal length of the second lens group,
Is.

Conditional expression (9) represents the condition between the focal length of the second lens group and the focal length of the lens located closest to the object in the second lens group. By satisfying the conditional expression (9), it is possible to obtain a high-performance zoom lens with high zoom ratio.

If the upper limit of conditional expression (9) is not exceeded, the front principal point of the second lens group can be positioned in the object direction. As a result, the zooming efficiency of the second lens group can be increased, so that a zoom lens with a high zooming ratio can be obtained.

By not lowering the lower limit value of the conditional expression (9), it is possible to reduce the aberration occurring in the lens of the second lens group which is located closest to the object side. As a result, it is possible to obtain a zoom lens in which coma aberration and field curvature at the wide-angle end are well corrected.

The zoom lens according to the present embodiment preferably satisfies the following conditional expression (10).
0.2≦(RG21+RG22)/(RG21−RG22)≦1.8 (10)
However,
RG21 is the radius of curvature of the object side surface of the lens arranged closest to the object in the second lens group,
RG22 is the radius of curvature of the image side surface of the lens disposed closest to the image side in the second lens group,
Is.

Conditional expression (10) is a conditional expression for the shape of the entire second lens group. By satisfying conditional expression (10), it is possible to obtain a high zoom lens in which the off-axis aberration at the wide-angle end is well corrected.

If the upper limit of conditional expression (10) is not exceeded, off-axis aberrations at the wide-angle end can be corrected well.

By not lowering the lower limit of conditional expression (10), the first lens group and the second lens group can be arranged closer to each other at the wide-angle end. Therefore, it becomes possible to increase the zoom ratio of the second lens group. As a result, it becomes easy to achieve a high zoom ratio.

The zoom lens according to the present embodiment preferably satisfies the following conditional expression (11).
−0.3≦(RG2L1R+RG2L2F)/(RG2L1R−RG2L2F)≦1 (11)
However,
RG2L1R is the radius of curvature of the image side surface of the lens disposed closest to the object side in the second lens group,
RG2L2F is the radius of curvature of the object side surface of the lens that is arranged second from the object side of the second lens group with an air gap in between,
Is.

Conditional expression (11) represents the condition of the shape of the air lens formed closest to the object side in the second lens group. By satisfying conditional expression (11), it is possible to obtain a zoom lens in which various aberrations in the entire zoom range are favorably corrected.

If the upper limit of conditional expression (11) is not exceeded, the magnification color correction at the wide-angle end can be corrected well.

By not falling below the lower limit of conditional expression (11), it becomes possible to satisfactorily correct field curvature at the wide-angle end and coma aberration occurring in the sagittal direction at the telephoto end.

In the zoom lens according to the present embodiment, it is preferable that the cemented lens is arranged in the second lens group and the following conditional expression (12) is satisfied.
0.3≦ndG2CP-ndG2CN (12)
However,
ndG2CP is the refractive index of the cemented positive lens in the second lens group at the d-line,
ndG2CN is the refractive index of the cemented negative lens at the d-line in the second lens group,
When the second lens group includes a plurality of cemented lenses,
ndG2CP is the maximum refractive index of the cemented positive lenses at the d-line,
ndG2CN is the minimum refractive index of the cemented negative lenses at the d-line,
Is.

Conditional expression (12) represents the difference in the refractive index of the glass material of the cemented lens arranged in the second lens group. It is possible to favorably correct coma aberration by providing a refractive index difference to the glass material of the cemented lens.

The zoom lens according to the present embodiment preferably satisfies the following conditional expression (13).
25≦νdG2CN−νdG2CP (13)
However,
νdG2CP is the Abbe's number at the d line of the cemented positive lens in the second lens group,
νdG2CN is the Abbe number at the d line of the cemented negative lens in the second lens group, and when the second lens group includes a plurality of cemented lenses,
νdG2CP is the minimum Abbe number among the Abbe numbers at the d-line of the cemented positive lens,
νdG2CN is the maximum Abbe number in the d-line of the cemented negative lens,
Is.

Conditional expression (13) represents the condition of the difference in Abbe number of the glass material of the cemented lens arranged in the second lens group.

The second lens group has a negative focal length. Therefore, a cemented lens having a negative lens and a positive lens is arranged in the second lens group. A glass material having a large Abbe number is used as the glass material of the negative lens, and a glass material having a small Abbe number is used as the glass material of the positive lens. By doing so, it is possible to excellently correct chromatic aberration.

By satisfying conditional expression (13), it is possible to obtain a zoom lens in which lateral chromatic aberration at the wide-angle end and axial chromatic aberration at the telephoto end are well corrected.

The zoom lens of the present embodiment preferably satisfies the following conditional expression (14).
−5≦(RG2R1+RG2R2)/(RG2R1-RG2R2)≦−2 (14)
However,
RG2R1 is the radius of curvature of the object side surface of the lens arranged closest to the image side in the second lens group,
RG2R2 is the radius of curvature of the image side surface of the lens disposed closest to the image side in the second lens group,
Is.

Conditional expression (14) represents the condition of the shape of the lens arranged closest to the image side in the second lens group. By satisfying conditional expression (14), it is possible to excellently correct the field curvature in the entire zoom range and the axial chromatic aberration at the telephoto end.

The zoom lens according to the present embodiment preferably satisfies the following conditional expression (15).
1.5≦(RG2r2RR+RG2r1RF)/(RG2r2RR-RG2r1RF)≦4.5 (15)
However,
RG2r2RR is the radius of curvature of the image side surface of the lens that is arranged second from the image side of the second lens group with an air gap in between,
RG2r1RF is the radius of curvature of the object side surface of the lens arranged closest to the image side in the second lens group,
Is.

Conditional expression (15) represents the condition of the shape of the air lens formed closest to the image side in the second lens group. By satisfying this conditional expression (15), it is possible to excellently correct the field curvature in the entire zoom range and the axial chromatic aberration at the telephoto end.

The zoom lens according to the present embodiment preferably satisfies the following conditional expression (16).
-0.5≤(RG2PF+RG2PR)/(RG2PF-RG2PR)≤0.5 (16)
However,
RG2PF is the radius of curvature of the object side surface of the positive lens arranged closest to the image in the second lens group,
RG2PR is the radius of curvature of the image side surface of the positive lens arranged closest to the image in the second lens group,
Is.

Conditional expression (16) represents the condition of the shape of the positive lens disposed closest to the image side in the second lens group. By satisfying conditional expression (16), it is possible to obtain a zoom lens in which aberrations are favorably corrected.

If the upper limit of conditional expression (16) is not exceeded, lateral chromatic aberration at the wide-angle end can be corrected well.

By not lowering the lower limit value of the conditional expression (16), it is possible to excellently correct the field curvature in the entire zoom range.

The zoom lens according to the present embodiment preferably satisfies the following conditional expression (17).
−2.5≦fT/ExpT≦0.3 (17)
However,
fT is the focal length of the entire zoom lens system at the telephoto end,
ExpT is the paraxial image plane reference exit pupil position at the telephoto end,
Is.

Conditional expression (17) is a conditional expression of the ratio between the focal length of the entire zoom lens system at the telephoto end and the exit pupil position. By satisfying conditional expression (17), reduction of distortion at the telephoto end and miniaturization of the optical system can be achieved.

By not exceeding the upper limit value of the conditional expression (17), it is possible to reduce an increase in the diameter of the lens in the lens group located closest to the image side and reduce the size of the entire optical system.

If the lower limit of conditional expression (17) is not exceeded, positive distortion at the telephoto end can be corrected well.

The zoom lens according to the present embodiment preferably satisfies the following conditional expression (18).
0.2≦f3G/fT≦0.33 (18)
However,
f3G is the focal length of the third lens group,
fT is the focal length of the entire zoom lens system at the telephoto end,
Is.

Conditional expression (18) represents the ratio of the focal length of the third lens group to the focal length of the entire zoom lens system at the telephoto end. By satisfying conditional expression (18), a compact and high-performance zoom lens can be obtained.

If the upper limit of conditional expression (18) is not exceeded, the amount of movement of the third lens group during zooming can be reduced. Therefore, it is possible to obtain a zoom lens having a short optical system.

If the lower limit value of conditional expression (18) is not exceeded, it becomes easy to correct aberrations generated in the third lens group, particularly spherical aberrations. Therefore, a high-performance zoom lens can be obtained.

It is preferable that the zoom lens of the present embodiment has a moving lens that moves in a direction perpendicular to the optical axis and satisfies the following conditional expression (19).
1.2≦fIS/fISG≦3 (19)
However,
fIS is the focal length of the moving lens,
fISG is the focal length of a lens group having a moving lens,
Is.

By making a part of the lenses of the lens group a moving lens and moving the moving lens in the direction perpendicular to the optical axis, it becomes possible to give the zoom lens a function of preventing camera shake.

Conditional expression (19) represents the ratio of the focal length of the moving lens to the focal length of the lens group having the moving lens. By satisfying the conditional expression (19), it is possible to reduce the moving amount of the moving lens at the time of preventing camera shake and maintain good imaging performance.

The moving lens may be a single lens or a cemented lens. Further, the number of moving lenses is not limited to one.

By not exceeding the upper limit value of the conditional expression (19), it is possible to reduce the influence of decentration aberration that occurs when the camera shake is prevented. As a result, high image forming performance can be maintained even when preventing camera shake.

By not lowering the lower limit value of the conditional expression (19), it is possible to reduce the moving amount of the moving lens when the camera shake is prevented. Therefore, the entire camera shake prevention unit can be downsized. In this way, not falling below the lower limit of conditional expression (19) leads to downsizing of the entire optical system.

In the zoom lens according to the present embodiment, it is preferable that the lens arranged in the third lens group be moved in the direction perpendicular to the optical axis.

The third lens group is a lens group in which an increase in the lens diameter is suppressed most in the optical system. Therefore, an increase in the weight of the lens can be suppressed. For this reason, some of the lenses in the third lens group or all the lenses in the third lens group are moved in the direction perpendicular to the optical axis. As described above, using the third lens group as the lens group including the lens that moves in the direction perpendicular to the optical axis is advantageous in that the camera shake prevention function can be performed at high speed.

When the lens is moved in the direction perpendicular to the optical axis, the position of the axial chief ray on the image plane changes. The third lens group can take a large amount of change in this position. Therefore, when the lens is moved in the vertical direction in order to obtain a predetermined camera shake prevention effect, it becomes possible to reduce the amount of movement of the lens in the third lens group.

For this reason, some of the lenses in the third lens group or all the lenses in the third lens group are moved in the direction perpendicular to the optical axis. As a result, it is possible to suppress an increase in the unit diameter for preventing camera shake. As described above, using the third lens group as the lens group having the lens that moves in the direction perpendicular to the optical axis is advantageous for downsizing the entire optical system.

The lens moved in the direction perpendicular to the optical axis may be a single lens or a cemented lens. Further, the number of lenses to be moved is not limited to one.

In the zoom lens of the present embodiment, it is preferable that the distance between the lens groups changes during zooming.

In the zoom lens according to the present embodiment, it is preferable that each lens group moves during zooming.

It is preferable that the first lens group moves toward the object side during zooming and is positioned closer to the object side at the telephoto end than at the wide-angle end. By doing so, it is possible to enhance the zooming action in the first lens group and the zooming action in the second lens group. As a result, it becomes easy to increase the magnification of the optical system.

Further, in the second lens group and the lens group located on the image side of the second lens group, it becomes easy to secure a moving space during zooming. Therefore, it is possible to reduce the total length of the optical system near the wide-angle end.

In the zoom lens according to the present embodiment, it is preferable that the first lens group includes at least two positive lenses.

The chromatic aberration generated in the first lens group is magnified by the lens group located on the image side of the first lens group. In this case, it becomes difficult to secure sufficient optical performance at the telephoto end. Therefore, it is necessary to suppress the occurrence of chromatic aberration in the first lens group as much as possible.

Therefore, at least two positive lenses are arranged in the first lens group. By doing so, the occurrence of chromatic aberration can be suppressed. As a result, a high zoom ratio can be achieved. Further, it is possible to improve the image forming performance at the telephoto end while properly maintaining the focal length of the first lens group.

In the zoom lens according to the present embodiment, it is more preferable that the first lens group includes at least one cemented lens.

As a result, chromatic aberration can be corrected even better.

In the zoom lens according to the present embodiment, it is preferable that the second lens group includes a configuration including a negative lens, a negative lens, and a positive lens in order from the object side.

The diameter of the optical system is mainly determined by the diameter of the first lens group. Therefore, it is preferable to reduce the diameter of the first lens group.

The second lens group and the third lens group are main lens groups responsible for zooming. In order to reduce the diameter of the first lens group and shorten the overall length of the optical system, it is necessary to reduce both the focal length of the second lens group and the focal length of the third lens group. If the focal length of the second lens group is reduced with a small number of lenses, various aberrations, particularly field curvature and distortion aberrations will occur greatly, and the variation of chromatic aberration of magnification during zooming will increase. Therefore, in high-zoom zooming, it is not possible to secure good imaging performance over the entire zoom range.

Therefore, in the second lens group, a negative lens, a negative lens, and a positive lens are arranged in order from the object side. By doing so, the focal length of the second lens group can be reduced while reducing the aberrations generated in each lens.

In the zoom lens according to the present embodiment, it is more preferable that, in the second lens group, the negative lens arranged second from the object side and the positive lens arranged third are cemented lenses.

By using a cemented lens for the negative lens and the positive lens, it is possible to excellently correct lateral chromatic aberration on the wide-angle side.

In the zoom lens according to the present embodiment, it is preferable that the second lens group has at least one aspherical lens.

By doing so, the aberration can be satisfactorily corrected.

In the zoom lens according to the present embodiment, it is more preferable that the lens located closest to the object in the second lens group has an aspherical surface.

By using an aspherical surface for the lens closest to the object side, it is possible to effectively correct off-axis aberrations on the wide-angle side, particularly coma, field curvature and distortion.

In the zoom lens of the present embodiment, a configuration including a positive lens, a positive lens, and a cemented lens in order from the object side is included in the third lens group, and the cemented lens includes a negative lens and a positive lens in order from the object side. It is preferable that

The third lens group is the main lens group responsible for zooming. Therefore, in the third lens group, it is necessary to minimize the aberration while reducing the focal length. Therefore, the third lens group includes, in order from the object side, a positive lens, a positive lens, and a cemented lens, and the cemented lens is composed of a negative lens and a positive lens in order from the object side. By doing so, spherical aberration, coma and axial chromatic aberration can be corrected well. As a result, it becomes easy to secure high image forming performance in the entire zoom range.

In the zoom lens of the present embodiment, it is more preferable that the diaphragm (brightness diaphragm) is located in front of or behind the third lens group (object side or image side).

By arranging the diaphragm in front of or behind the third lens group, the aberration generated in the third lens group can be reduced and the focal length of the third lens group can be shortened. For this reason, it is easy to achieve a high zoom ratio, and it is easy to ensure high imaging performance in the entire zoom range.

In the zoom lens of the present embodiment, it is more preferable that the third lens group has at least one aspherical lens.

As a result, spherical aberration can be corrected more, so that it becomes possible to improve the imaging performance in the entire zoom range.

In the zoom lens according to the present embodiment, the lens used for preventing camera shake is preferably the lens located closest to the object side or the lens located closest to the image side in the third lens group.

By using the lens located at the end of the lens group for the camera shake prevention, the camera shake prevention unit can be simplified.

In the zoom lens according to the present embodiment, it is preferable that the lens used for preventing camera shake has at least one cemented lens, or at least one lens having a positive focal length and at least one lens having a negative focal length. ..

By moving the lens, chromatic aberration occurs. Therefore, by doing this, even if the lens is moved, it is possible to prevent image quality deterioration due to the influence of the occurrence of chromatic aberration.

In the zoom lens according to the present embodiment, it is preferable that the entire lens group functions as a camera shake prevention lens group.

In this case, since various aberrations can be corrected in the lens group, it is possible to further improve the imaging performance when the camera shake is prevented.

In the zoom lens according to the present embodiment, it is preferable that the fourth lens group is a focusing lens group.

As described above, in the zoom lens according to the present embodiment, the refractive powers are arranged in order from the object side to the positive refractive power, the negative refractive power, the positive refractive power, the negative refractive power, and the positive refractive power. It has a configuration. Therefore, with this configuration, the effective diameter of the fourth lens group can be made smaller than that of the other lens groups. As a result, the weight of the focusing lens group can be reduced.

Further, in the fourth lens group, it is possible to suppress the occurrence of axial aberration. Therefore, by using the fourth lens group as the focus lens group, high imaging performance can be secured even when focusing on a close object.

Further, in the fourth lens group, focus sensitivity can be increased. Therefore, the amount of movement of the fourth lens unit can be reduced when focusing from an infinitely distant object to a close-up object and when focusing from a close-up object to an infinitely distant object. The focus sensitivity is the amount of change in the in-focus position when a lens group moves on the optical axis.

In the zoom lens according to the present embodiment, it is preferable that the fourth lens group be a wobbling group.

In the zoom lens of the present embodiment, the fifth lens group having the positive focal length is arranged on the image side of the fourth lens group having the negative focal length. Accordingly, even if the fourth lens group is moved to perform wobbling, it is possible to reduce the change in the height of the off-axis chief ray incident on the fourth lens group. As a result, it is possible to suppress variation in magnification during wobbling.

Therefore, by moving the fourth lens group during wobbling, it is possible to obtain a high-quality moving image that is always in focus.

In the zoom lens according to the present embodiment, it is preferable that the fourth lens group includes at least one negative lens and at least one positive lens.

This makes it possible to minimize the chromatic aberration generated in the fourth lens group. Further, in each zoom state, it is possible to reduce the fluctuation of the axial chromatic aberration from the time of focusing the object at infinity to the time of focusing the close object.

In the zoom lens according to the present embodiment, it is preferable that the fourth lens group be composed of one cemented lens including a negative lens and a positive lens.

This makes it possible to reduce the size of the fourth lens group and minimize chromatic aberration that occurs in the fourth lens group. Further, in each zoom state, it is possible to reduce the fluctuation of the axial chromatic aberration from the time of focusing the object at infinity to the time of focusing the close object.

In the zoom lens according to the present embodiment, it is preferable that the fifth lens group includes at least one negative lens and at least one positive lens.

This makes it possible to reduce the occurrence of lateral chromatic aberration in the entire zoom range. As a result, a high-performance zoom lens can be realized. Further, by having the negative lens, it is possible to reduce the occurrence of field curvature in the entire zoom range. As a result, a high-performance zoom lens can be realized.

In the zoom lens of the present embodiment, it is preferable that the fifth lens group be composed of one cemented lens including a negative lens and a positive lens.

This makes it possible to reduce the size of the fifth lens group and further reduce the occurrence of lateral chromatic aberration in the entire zoom range. Further, since the fifth lens group has a negative lens, it is possible to reduce the occurrence of field curvature in the entire zoom range. As a result, a high-performance zoom lens can be realized.

In the zoom lens according to the present embodiment, it is preferable that the fifth lens group include at least one aspherical lens.

As a result, the off-axis aberration can be corrected more effectively.

The image pickup apparatus according to the present embodiment is characterized by including the zoom lens described above and an image pickup element that converts an image formed by the zoom lens into an electric signal.

According to the image pickup apparatus of the present embodiment, it is possible to take a wide range of images and to take a magnified image of a distant subject with high resolution. In addition, it is possible to obtain a bright and blur-free image even for a dark subject.

The zoom lens and the imaging device described above may simultaneously satisfy a plurality of configurations. This is preferable in order to obtain a good zoom lens and a good imaging device. Also, the combination of preferable configurations is arbitrary. Further, for each conditional expression, only the upper limit value or the lower limit value of the numerical range of the more limited conditional expression may be limited.

For each conditional expression, the lower limit value or the upper limit value may be changed as follows. This is preferable because the effect of each conditional expression can be further ensured.

Conditional expression (1) is preferably as follows.
-7.2 is preferable and, as for an upper limit, -7.5 is more preferable.
The lower limit value is preferably -8.4, more preferably -8.3.
Conditional expression (2) is preferably as follows.
The upper limit value is preferably 59, more preferably 58.
The lower limit value is preferably 23.5, more preferably 25.
Conditional expression (3) is preferably as follows.
The lower limit value is preferably 57, more preferably 65.
The conditional expression (4) is preferably set as follows.
The lower limit value is preferably 1.90, more preferably 1.95.
The conditional expression (5) is preferably set as follows.
The lower limit value is preferably 58, more preferably 60.
Conditional expression (6) is preferably as follows.
The upper limit value is preferably 1.645, more preferably 1.62.
The conditional expression (7) is preferably set as follows.
The upper limit value is preferably 1.6, more preferably 1.5.
The lower limit value is preferably 0.77, more preferably 0.85.
Conditional expression (8) is preferably set as follows.
The upper limit value is preferably 1.4, more preferably 1.2.
The lower limit value is preferably 0.9, more preferably 0.95.
The conditional expression (9) is preferably set as follows.
The upper limit value is preferably 1.33, more preferably 1.31.
The lower limit value is preferably 0.9, more preferably 1.15.
The conditional expression (10) is preferably set as follows.
The upper limit value is preferably 1.5, more preferably 1.1.
The lower limit value is preferably 0.3, and more preferably 0.4.
Conditional expression (11) is preferably set as follows.
The upper limit is preferably 0.5, more preferably 0.2.
The lower limit value is preferably -0.27, more preferably -0.25.
The conditional expression (12) is preferably set as follows.
The lower limit value is preferably 0.33, more preferably 0.37.
Conditional expression (13) is preferably set as follows.
The lower limit value is preferably 31, and more preferably 35.
Conditional expression (14) is preferably set as follows.
-2.1 is preferable and, as for an upper limit, -2.2 is more preferable.
The lower limit value is preferably -4.7, more preferably -4.5.
Conditional expression (15) is preferably set as follows.
The upper limit value is preferably 4.2, more preferably 3.9.
The lower limit value is preferably 1.55, more preferably 1.65.
Conditional expression (16) is preferably set as follows.
The upper limit value is preferably 0.4, more preferably 0.32.
The lower limit value is preferably -0.46, more preferably -0.42.
Conditional expression (17) is preferably set as follows.
The upper limit value is preferably 0, more preferably -0.1.
The lower limit value is preferably -1.8, more preferably -0.9.
The conditional expression (18) is preferably set as follows.
The upper limit value is preferably 0.29, more preferably 0.26.
The lower limit value is preferably 0.21, and more preferably 0.22.
The conditional expression (19) is preferably set as follows.
The upper limit value is preferably 2.8, more preferably 2.4.
The lower limit value is preferably 1.25, more preferably 1.3.

Embodiments of the zoom lens will be described below in detail with reference to the drawings. The present invention is not limited to the embodiments.

A lens cross-sectional view will be described. (A) is a lens cross-sectional view at the wide-angle end, (b) is a lens cross-sectional view in an intermediate focal length state, and (c) is a lens cross-sectional view at the telephoto end.

Aberration diagrams will be described. (A) is spherical aberration (SA) at the wide-angle end, (b) is astigmatism (AS) at the wide-angle end, (c) is distortion aberration (DT) at the wide-angle end, and (d) is lateral chromatic aberration ( CC) is shown.

Further, (e) is spherical aberration (SA) in the intermediate focal length state, (f) is astigmatism (AS) in the intermediate focal length state, (g) is distortion aberration (DT) in the intermediate focal length state, (h). ) Indicates lateral chromatic aberration (CC) in the intermediate focal length state.

Further, (i) is spherical aberration (SA) at the telephoto end, (j) is astigmatism (AS) at the telephoto end, (k) is distortion aberration (DT) at the telephoto end, and (l) is magnification at the telephoto end. The chromatic aberration (CC) is shown.

The first lens group is G1, the second lens group is G2, the third lens group is G3, the fourth lens group is G4, the fifth lens group is G5, the aperture stop (brightness stop) is S, and the image plane (imaging plane). ) Is indicated by I. Further, a cover glass C of the image pickup element is arranged between the fifth lens group G5 and the image plane I.

Further, although not shown, a parallel plate forming a low pass filter may be arranged between the fifth lens group G5 and the image plane I. The surface of the parallel plate may be coated with a wavelength range limiting coat that limits infrared light. Further, a multi-layer film for limiting the wavelength range may be provided on the surface of the cover glass C. Further, the cover glass C may have a low-pass filter function.

The zoom lens of Embodiment 1 has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the object side and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side and then to the image side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the image side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Example 2 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the object side and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side and then to the image side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the image side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Embodiment 3 has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconvex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the biconvex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a biconvex positive lens L16 and a negative meniscus lens L17 having a convex surface directed toward the image side. Here, the biconvex positive lens L16 and the negative meniscus lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the object side surface of the biconvex positive lens L16, for a total of six surfaces. ..

The zoom lens of Embodiment 4 has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconvex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the biconvex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a biconvex positive lens L14 and a biconcave negative lens L15. Here, the biconvex positive lens L14 and the biconcave negative lens L15 are cemented.

The fifth lens group G5 includes a biconvex positive lens L16 and a negative meniscus lens L17 having a convex surface directed toward the image side. Here, the biconvex positive lens L16 and the negative meniscus lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the object side surface of the biconvex positive lens L16, for a total of six surfaces. ..

The zoom lens of Embodiment 5 has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the object side and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side and then to the image side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the image side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Embodiment 6 has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the object side and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the image side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Example 7 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a positive meniscus lens L8 having a convex surface directed toward the object side, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a convex surface directed toward the object side. It is composed of a positive meniscus lens L11 directed toward it, a negative meniscus lens L12 having a convex surface directed toward the object side, and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the object side and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on a total of 6 surfaces including both surfaces of the negative meniscus lens L4, both surfaces of the positive meniscus lens L8, an image side surface of the biconvex positive lens L13, and an image side surface of the biconvex positive lens L17.

The zoom lens of Example 8 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a positive meniscus lens L8 having a convex surface directed toward the object side, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a convex surface directed toward the object side. It is composed of a positive meniscus lens L11 directed toward it, a negative meniscus lens L12 having a convex surface directed toward the object side, and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the object side and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on a total of 6 surfaces including both surfaces of the negative meniscus lens L4, both surfaces of the positive meniscus lens L8, an image side surface of the biconvex positive lens L13, and an image side surface of the biconvex positive lens L17.

The zoom lens of Example 9 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the object side and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side and then to the image side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the image side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Example 10 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconvex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the biconvex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the image side, and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the object side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Example 11 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the object side and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the image side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Example 12 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, a biconvex positive lens L11, and a convex surface directed toward the object side. It is composed of a negative meniscus lens L12 facing the lens and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the biconvex positive lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the object side and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the biconvex positive lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the image side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Example 13 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconvex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the biconvex positive lens L2 are cemented.

The second lens group G2 includes a biconcave negative lens L4, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, a biconvex positive lens L11, and a convex surface directed toward the object side. It is composed of a negative meniscus lens L12 facing the lens and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the biconvex positive lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the image side, and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the biconvex positive lens L11 of the third lens group G3.

The aspherical surfaces are provided on a total of 6 surfaces including both surfaces of the biconcave negative lens L4, both surfaces of the biconvex positive lens L8, an image side surface of the biconvex positive lens L13, and an object side surface of the biconvex positive lens L17. There is.

The zoom lens of Example 14 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconvex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the biconvex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, a biconvex positive lens L11, and a convex surface directed toward the object side. It is composed of a negative meniscus lens L12 facing the lens and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the biconvex positive lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the image side, and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 of the third lens group G3 and the biconvex positive lens L11.

The aspherical surfaces are provided on a total of 6 surfaces including both surfaces of the biconcave negative lens L4, both surfaces of the biconvex positive lens L8, an image side surface of the biconvex positive lens L13, and an object side surface of the biconvex positive lens L17. There is.

The zoom lens of Example 15 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the object side and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side and then to the image side, and the fifth lens group G5 moves to the image side.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the image side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Example 16 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconvex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the biconvex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens L16 having a convex surface directed toward the image side, and a biconvex positive lens L17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side and then to the image side, and the fifth lens group G5 moves to the image side.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the object side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Example 17 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconvex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the biconvex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a negative meniscus lens 16 having a convex surface directed toward the image side, and a biconvex positive lens LL17. Here, the negative meniscus lens L16 and the biconvex positive lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the object side surface of the biconvex positive lens L17, for a total of six surfaces. ..

The zoom lens of Example 18 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a positive meniscus lens L2 having a convex surface directed toward the object side, and a positive meniscus lens L3 having a convex surface directed toward the object side. There is. Here, the negative meniscus lens L1 and the positive meniscus lens L2 are cemented.

The second lens group G2 includes a biconcave negative lens L4, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a positive meniscus lens L8 having a convex surface directed toward the object side, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a convex surface directed toward the object side. It is composed of a positive meniscus lens L11 directed toward it, a negative meniscus lens L12 having a convex surface directed toward the object side, and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a biconvex positive lens L16 and a negative meniscus lens L17 having a convex surface directed toward the image side. Here, the biconvex positive lens L16 and the negative meniscus lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on a total of 6 surfaces including both surfaces of the biconcave negative lens L4, both surfaces of the positive meniscus lens L8, an image side surface of the biconvex positive lens L13, and an object side surface of the biconvex positive lens L16. ..

The zoom lens of Example 19 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. And a fourth lens group G4 having a negative refractive power and a fifth lens group G5 having a positive refractive power. The aperture diaphragm (diaphragm) S is arranged in the third lens group G3.

The first lens group G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a plano-convex positive lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side. Here, the negative meniscus lens L1 and the plano-convex positive lens L2 are cemented.

The second lens group G2 includes a negative meniscus lens L4 having a convex surface directed toward the object side, a biconcave negative lens L5, a biconvex positive lens L6, and a negative meniscus lens L7 having a convex surface directed toward the image side. ing. Here, the biconcave negative lens L5 and the biconvex positive lens L6 are cemented.

The third lens group G3 includes an aperture stop S, a biconvex positive lens L8, a biconvex positive lens L9, a negative meniscus lens L10 having a convex surface directed toward the object side, and a positive meniscus lens L11 having a convex surface directed toward the object side. And a negative meniscus lens L12 having a convex surface directed toward the object side and a biconvex positive lens L13. Here, the negative meniscus lens L10 and the positive meniscus lens L11 are cemented. Further, the negative meniscus lens L12 and the biconvex positive lens L13 are cemented together.

The fourth lens group G4 includes a negative meniscus lens L14 having a convex surface directed toward the object side and a positive meniscus lens L15 having a convex surface directed toward the object side. Here, the negative meniscus lens L14 and the positive meniscus lens L15 are cemented.

The fifth lens group G5 includes a biconvex positive lens L16 and a negative meniscus lens L17 having a convex surface directed toward the image side. Here, the biconvex positive lens L16 and the negative meniscus lens L17 are cemented.

During zooming from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens The group G4 moves to the object side and then to the image side, and the fifth lens group G5 is fixed.

During focusing from an object at infinity to a near object, the fourth lens group G4 moves to the image side. During camera shake correction, the cemented lens of the negative meniscus lens L12 and the biconvex positive lens L13 of the third lens group G3 moves in the direction orthogonal to the optical axis. Alternatively, the lens that moves during camera shake correction may be a cemented lens of the negative meniscus lens L10 and the positive meniscus lens L11 of the third lens group G3.

The aspherical surfaces are provided on both surfaces of the negative meniscus lens L4, both surfaces of the biconvex positive lens L8, the image side surface of the biconvex positive lens L13, and the object side surface of the biconvex positive lens L16, for a total of six surfaces. ..

The numerical data of each of the above examples are shown below. In the surface data, r is the radius of curvature of each lens surface, d is the distance between the lens surfaces, nd is the d-line refractive index of each lens, νd is the Abbe number of each lens, and the * mark is an aspherical surface.

In the zoom data, WE represents the wide-angle end, ST represents the intermediate focal length state, and TE represents the telephoto end. Further, f is the focal length of the entire system, FNO. Is the F number, ω is the half angle of view, IH is the image height, BF is the back focus, and LTL is the total length of the optical system. The back focus is the distance from the lens surface closest to the image side to the paraxial image surface in air conversion. The total length is the distance from the lens surface closest to the object side to the lens surface closest to the image side plus the back focus.

Further, f1, f2,... Are focal lengths of each lens group in each group focal length.

Further, the aspherical surface shape is given by expressed.
^{z = (y 2 / r)} / [1+ {1- (1 + k) (y / r) 2} 1/2]
+A4y ⁴ +A6y ⁶ +A8y ⁸ +A10y ¹⁰ +A12y ¹² +...
In addition, in the aspherical surface coefficient, "en" (n is an integer) indicates "10- ⁿ ". The symbols of these specification values are common to the numerical data of the examples described later.

Numerical Example 1
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 94.387 2.50 1.85478 24.80
2 67.783 7.13 1.49700 81.54
3 ∞ 0.15
4 61.099 5.02 1.49700 81.54
5 172.659 Variable
6* 231.854 1.65 1.88227 37.18
7* 14.124 7.35
8 -22.507 1.00 1.59282 68.62
9 32.319 4.23 2.00069 25.46
10 -44.031 1.39
11 -21.208 1.20 1.83481 42.73
12 -40.812 Variable
13 (Aperture) ∞ 1.50
14* 24.286 4.49 1.58253 59.32
15* -700.000 4.37
16 56.643 3.37 1.49700 81.54
17 -56.643 0.50
18 43.590 1.00 1.91082 35.25
19 15.142 4.13 1.49700 81.54
20 47.223 1.20
21 24.303 0.80 1.85478 24.80
22 16.800 5.10 1.58253 59.32
23* -71.500 variable
24 188.666 0.90 1.83481 42.73
25 11.201 3.10 1.80809 22.76
26 18.472 Variable
27 30.000 1.20 2.00100 29.13
28 20.454 9.46 1.51593 64.25
29* -31.238 12.22
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-7.50532e-06,A6=1.23396e-07,A8=-4.26522e-10,A10=6.20739e-13
7th side
k=0.000
A4=-3.12688e-05,A6=6.45994e-08,A8=-5.06358e-10,A10=1.39139e-11,
A12=-1.22469e-13,A14=3.55245e-16
14th surface
k=0.000
A4=-1.21943e-05,A6=-3.40663e-08,A8=-3.04610e-11,A10=4.72594e-13
15th surface
k=0.000
A4=7.50787e-06,A6=-4.91245e-08,A8=9.97723e-11
Surface 23
k=0.000
A4=7.76950e-06,A6=-7.45428e-09,A8=-5.82084e-11
29th surface
k=0.000
A4=3.64978e-06,A6=-5.98934e-08,A8=1.63111e-10,A10=-4.69751e-13

Zoom data
WE ST TE
f 12.36 34.62 97.98
FNO. 4.08 4.08 4.08
2 ω 83.05 33.74 12.12
BF(in air) 15.67 15.65 15.69
LTL(in air) 134.09 150.19 176.02
d5 0.72 25.09 53.60
d12 37.65 13.89 1.30
d23 2.44 10.11 20.20
d26 4.87 12.72 12.50

Focal length of each group
f1=110.52 f2=-14.17 f3=23.28 f4=-24.12 f5=39.58

Numerical value example 2
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 92.076 2.50 1.85478 24.80
2 66.463 7.23 1.49700 81.54
3 ∞ 0.15
4 60.017 5.04 1.49 700 81.54
5 165.389 Variable
6* 150.938 1.65 1.88227 37.18
7* 13.667 7.35
8 -21.491 1.00 1.59282 68.62
9 31.144 4.13 2.00069 25.46
10 -42.582 1.17
11 -22.083 1.20 1.83481 42.73
12 -49.886 Variable
13 (Aperture) ∞ 1.50
14* 23.726 4.23 1.58253 59.32
15* -416.167 4.15
16 52.017 3.48 1.49700 81.54
17 -52.017 0.50
18 66.000 1.00 1.91082 35.25
19 15.750 3.81 1.49700 81.54
20 62.829 1.20
21 23.802 0.80 1.85478 24.80
22 17.322 5.17 1.58253 59.32
23* -56.874 Variable
24 154.658 0.90 1.83481 42.73
25 11.055 3.48 1.80809 22.76
26 17.500 Variable
27 30.000 1.20 2.00100 29.13
28 20.354 10.00 1.51593 64.25
29* -31.081 11.35
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-5.71018e-06,A6=8.04156e-08,A8=-2.16056e-10,A10=2.98312e-13,
A12=5.00000e-17
7th side
k=0.000
A4=-2.80152e-05,A6=3.52486e-08,A8=-1.99144e-09,A10=5.01593e-11,
A12=-5.07690e-13,A14=1.99802e-15
14th surface
k=0.000
A4=-7.30206e-06,A6=-5.47006e-08,A8=8.97192e-11,A10=-2.64931e-13
15th surface
k=0.000
A4=1.56126e-05,A6=-7.25350e-08,A8=2.12984e-10,A10=-7.46710e-13
Surface 23
k=0.000
A4=1.04497e-05,A6=6.73868e-09,A8=-3.08576e-11
29th surface
k=0.000
A4=4.07614e-06,A6=-7.27569e-08,A8=2.16624e-10,A10=-5.77199e-13

Zoom data
WE ST TE
f 12.36 34.63 98.01
FNO. 4.07 4.07 4.07
2 ω 83.05 33.70 12.09
BF(in air) 14.79 14.78 14.83
LTL(in air) 132.16 148.03 174.29
d5 0.64 24.35 53.29
d12 35.84 12.97 1.30
d23 2.44 10.16 19.66
d26 5.59 12.92 12.37

Focal length of each group
f1=108.76 f2=-13.51 f3=22.60 f4=-23.36 f5=39.71

Numerical Example 3
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 138.864 2.50 1.85478 24.80
2 93.630 4.81 1.49700 81.54
3 -3355.271 0.15
4 60.642 4.43 1.49700 81.54
5 174.982 Variable
6* 547.663 1.50 1.88202 37.22
7* 16.167 8.05
8 -23.902 1.00 1.61800 63.40
9 36.492 4.66 2.00069 25.46
10 -42.975 2.79
11 -19.012 1.00 1.88300 40.76
12 -30.591 Variable
13 (Aperture) ∞ 1.50
14* 26.075 4.08 1.58313 59.38
15* -282.871 4.00
16 35.853 3.75 1.49700 81.54
17 -64.689 0.50
18 47.932 1.00 1.91082 35.25
19 16.686 2.29 1.49700 81.54
20 24.749 1.20
21 23.568 0.90 1.85478 24.80
22 16.012 5.57 1.58313 59.38
23*-50.961 variable
24 214.189 0.90 1.83481 42.73
25 12.571 2.64 1.80810 22.76
26 18.917 Variable
27* 44.742 7.78 1.49700 81.54
28 -24.960 1.30 1.90366 31.32
29 -29.434 14.36
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-2.16835e-06,A6=1.31298e-07,A8=-5.06743e-10,A10=7.69634e-13
7th side
k=0.000
A4=-2.19260e-05,A6=6.66708e-08,A8=7.53277e-10,A10=-4.44491e-12
14th surface
k=0.000
A4=-7.65240e-06,A6=-1.02176e-08,A8=5.46368e-11
15th surface
k=0.000
A4=1.33574e-05, A6=-1.83553e-08, A8=7.53148e-11
Surface 23
k=0.000
A4=8.79672e-06, A6=5.90701e-10
27th surface
k=0.000
A4=-2.95297e-07, A6=1.46181e-08

Zoom data
WE ST TE
f 12.24 30.98 78.38
FNO. 4.08 4.08 4.08
2 ω 83.95 38.23 15.30
BF(in air) 17.82 17.78 17.76
LTL (in air) 132.31 141.24 172.65
d5 0.60 19.78 52.91
d12 38.68 13.03 1.20
d23 2.50 10.48 20.35
d26 4.40 11.88 12.13

Focal length of each group
f1=127.08 f2=-15.45 f3=23.33 f4=-24.54 f5=40.36

Numerical Example 4
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 95.525 2.30 1.85478 24.80
2 68.074 7.55 1.49700 81.54
3 -767.529 0.15
4 62.581 4.78 1.49700 81.54
5 174.408 variable
6* 243.654 1.50 1.88202 37.22
7* 14.287 7.55
8 -19.803 1.20 1.61800 63.40
9 38.059 4.59 2.00069 25.46
10 -34.196 1.40
11 -19.169 1.30 1.88300 40.76
12 -34.403 Variable
13 (Aperture) ∞ 1.50
14* 21.814 5.18 1.58313 59.38
15* -91.531 3.12
16 290.000 3.04 1.49700 81.54
17 -36.113 0.40
18 116.284 1.00 1.91082 35.25
19 16.738 3.29 1.49700 81.54
20 45.083 1.20
21 24.279 0.80 1.85478 24.80
22 17.124 5.44 1.58313 59.38
23* -49.287 Variable
24 102.058 2.91 1.80809 22.76
25 -24.502 0.90 1.80610 40.92
26 17.396 Variable
27* 30.000 9.31 1.49700 81.54
28 -22.231 1.30 2.00100 29.13
29 -33.019 11.87
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-1.88239e-05,A6=3.02782e-07,A8=-1.26448e-09,A10=2.07030e-12
7th side
k=0.000
A4=-4.82209e-05,A6=1.44150e-07,A8=2.12599e-09,A10=-1.43449e-11
14th surface
k=0.000
A4=-1.44228e-05, A6=-1.81726e-08, A8=4.98079e-11
15th surface
k=0.000
A4=1.95511e-05,A6=-3.48201e-08,A8=1.12912e-10
Surface 23
k=0.000
A4=7.96460e-06,A6=1.93548e-08,A8=-3.83185e-11
27th surface
k=0.000
A4=1.00000e-06,A6=4.26086e-08,A8=-9.41927e-11

Zoom data
WE ST TE
f 12.35 34.62 98.01
FNO. 4.05 4.07 4.06
2 ω 82.40 34.12 12.21
BF(in air) 15.27 15.24 15.32
LTL(in air) 130.50 138.78 174.07
d5 0.60 16.72 52.69
d12 35.40 9.82 1.30
d23 2.54 13.52 19.51
d26 4.98 11.77 13.56

Focal length of each group
f1=106.10 f2=-14.02 f3=23.37 f4=-26.62 f5=42.56

Numerical Example 5
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 92.330 2.30 1.85478 24.80
2 66.183 7.33 1.49700 81.54
3 ∞ 0.15
4 58.624 5.27 1.49700 81.54
5 170.722 Variable
6* 199.597 1.50 1.88202 37.22
7* 13.743 7.30
8 -21.554 1.20 1.59282 68.62
9 30.689 4.24 2.00069 25.46
10 -41.517 1.78
11 -20.439 1.30 1.83481 42.73
12 -45.367 Variable
13 (Aperture) ∞ 1.50
14* 24.022 4.00 1.58313 59.38
15* -5000.000 4.02
16 59.547 3.62 1.49700 81.54
17 -43.776 0.50
18 46.990 1.00 1.91082 35.25
19 15.619 3.51 1.49700 81.54
20 40.630 1.20
21 20.659 0.80 1.85478 24.80
22 15.352 5.79 1.51633 64.06
23* -48.459 Variable
24 142.418 0.90 1.83481 42.73
25 10.808 3.25 1.80809 22.76
26 17.500 Variable
27 30.000 1.30 2.00100 29.13
28 19.978 10.08 1.51633 64.14
29* -30.675 10.84
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-1.77339e-06,A6=7.59356e-08,A8=-2.74484e-10,A10=4.67371e-13
7th side
k=0.000
A4=-2.40353e-05, A6=-2.17379e-08, A8=4.85237e-10, A10=-3.05745e-12
14th surface
k=0.000
A4=-7.74508e-06,A6=-3.08062e-08,A8=-3.85797e-10
15th surface
k=0.000
A4=1.67327e-05,A6=-3.37654e-08,A8=-4.42299e-10
Surface 23
k=0.000
A4=1.24090e-05, A6=4.13154e-09, A8=2.08033e-11
29th surface
k=0.000
A4=8.38521e-07,A6=-4.73583e-08,A8=6.37866e-11,A10=-3.10086e-13

Zoom data
WE ST TE
f 12.28 34.63 98.00
FNO. 4.07 4.09 4.07
2 ω 83.45 33.74 12.10
BF(in air) 14.30 14.28 14.30
LTL(in air) 132.17 145.12 174.08
d5 0.60 21.63 52.68
d12 34.88 11.37 1.30
d23 2.51 11.36 19.52
d26 6.02 12.62 12.43

Focal length of each group
f1=106.03 f2=-13.12 f3=22.52 f4=-23.60 f5=39.97

Numerical Example 6
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 94.644 2.50 1.85478 24.80
2 68.036 7.05 1.49700 81.54
3 ∞ 0.15
4 60.062 5.10 1.49700 81.54
5 173.633 Variable
6* 202.797 1.65 1.88202 37.22
7* 14.079 7.40
8 -20.580 1.00 1.59282 68.62
9 34.497 4.23 2.00069 25.46
10 -39.610 1.41
11 -19.623 1.20 1.83481 42.73
12 -37.436 variable
13 (Aperture) ∞ 1.50
14* 23.558 4.21 1.58313 59.38
15* -297.671 4.10
16 55.026 3.62 1.49700 81.54
17 -45.245 0.50
18 64.615 1.00 1.91082 35.25
19 15.638 3.58 1.49 700 81.54
20 45.000 1.20
21 23.579 0.80 1.85478 24.80
22 17.001 5.30 1.58313 59.38
23* -55.002 Variable
24 135.353 0.90 1.83481 42.73
25 11.000 3.15 1.80809 22.76
26 17.566 Variable
27 30.000 1.20 2.00100 29.13
28 20.204 9.95 1.51633 64.14
29* -31.360 11.12
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-7.61514e-06,A6=1.72618e-07,A8=-7.73140e-10,A10=1.40082e-12
7th side
k=0.000
A4=-3.27699e-05,A6=1.47073e-07,A8=-2.57495e-09,A10=6.05980e-11,
A12=-5.97956e-13,A14=1.88456e-15
14th surface
k=0.000
A4=-7.00824e-06,A6=-1.80540e-08,A8=-1.23124e-10,A10=4.63732e-13
15th surface
k=0.000
A4=1.88380e-05, A6=-3.00983e-08, A8=-3.56964e-11
Surface 23
k=0.000
A4=9.95603e-06,A6=-8.71075e-09,A8=2.57174e-10,A10=-1.23011e-12
29th surface
k=0.000
A4=1.00890e-06,A6=-6.12315e-08,A8=1.92293e-10,A10=-6.86329e-13

Zoom data
WE ST TE
f 12.36 34.63 98.00
FNO. 4.08 4.09 4.08
2 ω 83.11 33.79 12.14
BF(in air) 14.56 14.54 14.57
LTL(in air) 132.06 144.57 174.08
d5 0.63 22.06 53.63
d12 36.14 11.89 1.30
d23 2.51 11.14 19.27
d26 5.52 12.24 12.61

Focal length of each group
f1=108.72 f2=-13.76 f3=22.80 f4=-23.91 f5=40.12

Numerical Example 7
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 94.862 2.30 1.85478 24.80
2 67.725 7.14 1.49700 81.54
3 ∞ 0.15
4 59.563 5.29 1.49700 81.54
5 178.829 Variable
6* 277.602 1.50 1.85135 40.10
7* 13.987 7.35
8 -21.989 1.20 1.59282 68.62
9 32.063 4.03 2.00069 25.46
10 -47.556 1.55
11 -20.983 1.30 1.83481 42.73
12 -39.971 Variable
13 (Aperture) ∞ 1.50
14* 22.814 3.69 1.58313 59.38
15* 132.921 3.41
16 42.076 3.94 1.49700 81.54
17 -47.024 0.50
18 44.313 1.00 1.91082 35.25
19 14.663 3.76 1.49700 81.54
20 39.990 1.20
21 25.520 0.80 1.85478 24.80
22 19.002 4.79 1.59201 67.02
23* -56.434 Variable
24 121.261 0.90 1.83481 42.73
25 10.763 3.78 1.80809 22.76
26 17.840 Variable
27 30.000 1.30 2.00100 29.13
28 19.143 10.34 1.51633 64.14
29* -30.227 11.61
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=1.57456e-06,A6=7.02732e-08,A8=-2.65285e-10,A10=4.29620e-13
7th side
k=0.000
A4=-1.96584e-05,A6=1.15738e-08,A8=3.66175e-10,A10=-8.43569e-13
14th surface
k=0.000
A4=-9.11595e-06,A6=-3.53021e-08,A8=-3.79037e-10
15th surface
k=0.000
A4=1.58570e-05, A6=-4.11512e-08, A8=-4.06231e-10
Surface 23
k=0.000
A4=9.20006e-06,A6=-6.86593e-10
29th surface
k=0.000
A4=-2.51883e-07,A6=-4.61441e-08,A8=5.59859e-11,A10=-4.61977e-13

Zoom data
WE ST TE
f 12.28 34.62 98.00
FNO. 4.07 4.07 4.07
2 ω 83.44 33.75 12.10
BF(in air) 15.06 15.03 15.06
LTL (in air) 132.16 145.32 174.07
d5 0.60 22.15 53.23
d12 35.79 11.86 1.30
d23 2.51 10.97 19.04
d26 5.48 12.59 12.73

Focal length of each group
f1=107.50 f2=-13.69 f3=22.60 f4=-24.80 f5=41.14

Numerical Example 8
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 94.903 2.30 1.85478 24.80
2 67.906 7.01 1.49700 81.54
3 ∞ 0.15
4 59.377 5.29 1.49700 81.54
5 180.701 Variable
6* 266.105 1.50 1.85135 40.10
7* 14.041 7.40
8 -23.048 1.20 1.59282 68.62
9 29.447 4.20 2.00069 25.46
10 -47.325 1.31
11 -21.940 1.30 1.83481 42.73
12-50.649 Variable
13 (Aperture) ∞ 1.50
14* 22.959 3.91 1.58313 59.38
15* 355.464 3.67
16 56.909 3.67 1.49700 81.54
17 -46.024 0.50
18 50.779 1.00 1.91082 35.25
19 15.223 3.88 1.49700 81.54
20 54.561 1.20
21 24.498 0.80 1.85478 24.80
22 17.421 5.13 1.59201 67.02
23* -56.759 Variable
24 119.978 0.90 1.80400 46.57
25 10.171 3.48 1.80809 22.76
26 16.076 Variable
27 30.000 1.30 2.00100 29.13
28 19.033 10.44 1.51633 64.14
29* -29.578 10.82
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=4.11148e-06,A6=3.99766e-08,A8=-1.70384e-10,A10=3.05186e-13
7th side
k=0.000
A4=-1.44023e-05, A6=-1.63674e-08, A8=4.86033e-10, A10=-2.82106e-12
14th surface
k=0.000
A4=-9.56972e-06,A6=-3.09123e-08,A8=-3.27923e-10
15th surface
k=0.000
A4=1.51315e-05, A6=-3.70823e-08, A8=-3.59209e-10
Surface 23
k=0.000
A4=8.87338e-06, A6=-1.90718e-10
29th surface
k=0.000
A4=-3.51851e-06,A6=-2.18767e-08,A8=-1.07188e-10,A10=-1.48622e-13

Zoom data
WE ST TE
f 12.28 34.62 97.99
FNO. 4.07 4.09 4.09
2 ω 83.43 33.75 12.11
BF(in air) 14.28 14.23 14.27
LTL (in air) 132.13 143.18 172.65
d5 0.60 20.93 52.49
d12 36.06 11.53 1.30
d23 2.50 11.10 18.71
d26 5.65 12.35 12.85

Focal length of each group
f1=106.76 f2=-13.56 f3=22.39 f4=-23.64 f5=40.79

Numerical Example 9
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 97.776 2.50 1.85478 24.80
2 70.393 7.00 1.49700 81.54
3 ∞ 0.15
4 62.473 5.07 1.49700 81.54
5 182.546 Variable
6* 233.595 2.50 1.80610 40.92
7* 13.697 8.10
8 -21.099 1.20 1.59282 68.62
9 35.528 3.92 2.00069 25.46
10 -51.395 1.69
11 -20.079 1.30 1.83481 42.73
12 -31.621 Variable
13 (Aperture) ∞ 1.50
14* 24.177 4.32 1.58313 59.38
15* -202.531 3.92
16 43.364 3.76 1.49700 81.54
17 -53.186 0.50
18 85.412 1.00 1.91082 35.25
19 15.740 3.55 1.49 700 81.54
20 45.000 1.20
21 25.562 0.80 1.85478 24.80
22 18.554 5.14 1.58313 59.38
23* -47.600 variable
24 171.263 0.90 1.83481 42.73
25 11.122 3.31 1.80809 22.76
26 19.000 Variable
27 30.000 1.30 2.00100 29.13
28 19.782 9.85 1.51633 64.14
29* -32.052 11.40
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-6.23383e-06,A6=1.01504e-07,A8=-3.40772e-10,A10=4.60986e-13
7th side
k=0.000
A4=-3.21777e-05,A6=3.09142e-08,A8=-3.76476e-10,A10=1.19180e-11,
A12=-1.04587e-13,A14=1.67217e-16
14th surface
k=0.000
A4=-4.57303e-06,A6=-4.16211e-09,A8=-9.99965e-11,A10=5.55856e-13
15th surface
k=0.000
A4=1.92873e-05,A6=-1.72071e-08,A8=1.88390e-11
Surface 23
k=0.000
A4=9.52491e-06,A6=8.39073e-10,A8=6.01858e-11
29th surface
k=0.000
A4=2.86058e-06,A6=-7.29324e-08,A8=2.99285e-10,A10=-1.03066e-12

Zoom data
WE ST TE
f 12.28 34.63 98.00
FNO. 4.08 4.07 4.08
2 ω 83.48 33.75 12.10
BF(in air) 14.85 14.83 14.87
LTL (in air) 136.55 146.53 178.11
d5 0.60 20.72 54.78
d12 38.49 11.99 1.30
d23 2.56 11.74 19.78
d26 5.55 12.75 12.88

Focal length of each group
f1=112.33 f2=-14.27 f3=23.50 f4=-25.15 f5=41.37

Numerical Example 10
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 93.435 2.30 1.85478 24.80
2 67.476 7.36 1.49700 81.54
3 -407 0.905 0.15
4 58.563 5.22 1.49700 81.54
5 169.257 Variable
6* 435.257 1.50 1.88202 37.22
7* 14.713 7.45
8 -19.285 1.20 1.61800 63.40
9 38.636 4.64 2.00069 25.46
10 -35.100 1.62
11 -18.834 1.30 1.88300 40.76
12 -32.239 Variable
13 (Aperture) ∞ 1.50
14* 21.901 4.33 1.58313 59.38
15* -264.540 3.44
16 89.201 3.34 1.53775 74.70
17 -40.822 0.40
18 70.377 1.00 1.91082 35.25
19 15.392 3.47 1.49700 81.54
20 40.910 1.20
21 23.876 0.80 1.85478 24.80
22 17.038 5.25 1.58313 59.38
23* -52.928 Variable
24 174.914 0.90 1.83481 42.73
25 11.062 3.34 1.80809 22.76
26 18.825 Variable
27 30.000 1.30 2.00100 29.13
28 21.715 9.68 1.49700 81.54
29* -32.034 12.00
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-2.09906e-06,A6=1.69300e-07,A8=-7.61489e-10,A10=1.42413e-12
7th side
k=0.000
A4=-2.63401e-05,A6=1.05588e-07,A8=8.58335e-10,A10=-4.56534e-12
14th surface
k=0.000
A4=-9.76379e-06,A6=4.51506e-09,A8=-2.24038e-10
15th surface
k=0.000
A4=2.13406e-05, A6=-4.11329e-09, A8=-2.02182e-10
Surface 23
k=0.000
A4=7.55568e-06,A6=1.10690e-08,A8=3.53798e-11
29th surface
k=0.000
A4=2.96901e-06,A6=-5.66675e-08,A8=2.18503e-10,A10=-5.85823e-13

Zoom data
WE ST TE
f 12.36 34.63 98.01
FNO. 4.08 4.08 4.07
2 ω 82.61 33.96 12.18
BF(in air) 15.45 15.42 15.48
LTL (in air) 131.44 144.74 173.20
d5 0.62 21.29 52.51
d12 35.39 11.67 1.30
d23 2.56 11.06 18.35
d26 4.71 12.59 12.86

Focal length of each group
f1=104.96 f2=-13.85 f3=22.93 f4=-24.83 f5=40.37

Numerical Example 11
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 96.654 2.50 1.85478 24.80
2 68.972 7.05 1.49700 81.54
3 ∞ 0.15
4 59.662 5.16 1.49700 81.54
5 174.229 Variable
6* 162.713 1.65 1.88052 37.17
7* 13.850 7.36
8 -21.183 1.00 1.59282 68.62
9 31.779 4.15 2.00069 25.46
10 -43.296 1.35
11 -21.193 1.20 1.83481 42.73
12 -42.594 Variable
13 (Aperture) ∞ 1.50
14* 23.901 4.14 1.58253 59.32
15* -406.739 3.84
16 48.100 3.70 1.49700 81.54
17 -48.100 0.50
18 66.000 1.00 1.91082 35.25
19 15.507 3.71 1.49700 81.54
20 50.727 1.20
21 24.523 0.80 1.85478 24.80
22 17.859 5.12 1.58253 59.32
23* -52.522 Variable
24 134.838 0.90 1.83481 42.73
25 11.000 3.47 1.80809 22.76
26 17.500 Variable
27 30.000 1.20 2.00100 29.13
28 19.799 10.10 1.51593 64.25
29* -30.584 11.14
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-5.77781e-06,A6=1.10300e-07,A8=-3.78631e-10,A10=4.50834e-13,
A12=1.02073e-15, A14=-1.91695e-18
7th side
k=0.000
A4=-2.82349e-05,A6=1.10626e-07,A8=-3.02561e-09,A10=6.48799e-11,
A12=-6.00343e-13,A14=2.12998e-15
14th surface
k=0.000
A4=-5.77715e-06,A6=-6.66472e-08,A8=2.81951e-10,A10=-2.02398e-12
15th surface
k=0.000
A4=1.87021e-05, A6=-7.22335e-08, A8=2.50887e-10, A10=-1.96088e-12
Surface 23
k=0.000
A4=9.56313e-06,A6=4.31157e-09,A8=8.43502e-12
29th surface
k=0.000
A4=3.70582e-06,A6=-9.46558e-08,A8=3.92268e-10,A10=-1.24714e-12

Zoom data
WE ST TE
f 12.36 34.63 98.01
FNO. 4.08 4.07 4.08
2 ω 83.03 33.73 12.10
BF(in air) 14.59 14.57 14.63
LTL(in air) 132.16 145.00 174.30
d5 0.64 22.24 53.61
d12 36.16 12.06 1.30
d23 2.51 10.99 19.49
d26 5.52 12.40 12.55

Focal length of each group
f1=109.32 f2=-13.73 f3=22.67 f4=-23.85 f5=40.26

Numerical Example 12
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 94.366 2.50 1.85478 24.80
2 68.468 7.10 1.49700 81.54
3 ∞ 0.15
4 63.551 5.04 1.49700 81.54
5 181.501 Variable
6* 3133.633 1.65 1.88227 37.18
7* 15.184 7.37
8 -21.101 1.00 1.59282 68.62
9 40.498 4.73 2.00069 25.46
10 -36.316 1.25
11 -20.635 1.20 1.83481 42.73
12 -40.395 Variable
13 (Aperture) ∞ 1.50
14* 23.840 4.55 1.58253 59.32
15* -426.939 4.68
16 526.800 2.98 1.49700 81.54
17 -39.013 0.50
18 67.963 1.00 1.91082 35.25
19 17.675 5.85 1.49700 81.54
20 -82.478 1.20
21 32.342 0.80 1.85478 24.80
22 21.913 3.70 1.58253 59.32
23* -546.379 Variable
24 193.583 0.90 1.83481 42.73
25 12.026 3.04 1.80809 22.76
26 19.719 Variable
27 30.000 2.10 2.00100 29.13
28 20.365 9.83 1.51593 64.25
29* -31.797 13.21
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-6.31402e-06,A6=1.94733e-07,A8=-8.23491e-10,A10=1.31860e-12
7th side
k=0.000
A4=-3.04438e-05,A6=1.02028e-07,A8=1.01245e-09,A10=2.84462e-13,
A12=-6.29940e-14,A14=1.34598e-16
14th surface
k=0.000
A4=-1.14806e-05,A6=-4.58752e-08,A8=9.39748e-11,A10=5.17355e-13
15th surface
k=0.000
A4=1.22534e-05,A6=-6.09464e-08,A8=1.78078e-10,A10=3.23059e-13
Surface 23
k=0.000
A4=-5.23796e-07,A6=8.34472e-09,A8=-5.40068e-11
29th surface
k=0.000
A4=5.10991e-06,A6=-4.20251e-08,A8=6.43559e-11,A10=-1.58035e-13

Zoom data
WE ST TE
f 12.36 34.63 98.01
FNO. 4.08 4.08 4.09
2 ω 83.01 33.73 12.13
BF(in air) 16.66 16.63 16.69
LTL (in air) 137.04 155.06 181.47
d5 0.85 26.38 54.59
d12 38.10 14.21 1.30
d23 2.36 10.34 20.90
d26 4.45 12.89 13.36

Focal length of each group
f1=112.04 f2=-14.43 f3=24.11 f4=-25.87 f5=40.08

Numerical Example 13
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 94.549 2.50 1.85478 24.80
2 68.094 7.10 1.49700 81.54
3 -51694.132 0.15
4 61.764 5.04 1.49700 81.54
5 179.112 Variable
6* -1061.313 1.65 1.88227 37.18
7* 15.238 7.37
8 -21.012 1.00 1.59282 68.62
9 40.169 4.69 2.00069 25.46
10 -36.096 1.35
11 -20.354 1.20 1.83481 42.73
12 -38.760 Variable
13 (Aperture) ∞ 1.50
14* 23.691 4.57 1.58253 59.32
15* -426.121 4.89
16 282.161 3.09 1.49700 81.54
17 -38.945 0.50
18 80.781 1.00 1.91082 35.25
19 17.475 4.79 1.49700 81.54
20 -108.796 1.20
21 30.543 0.80 1.85478 24.80
22 21.495 0.01 1.56384 60.67
23 21.495 3.98 1.58253 59.32
24* -217.658 variable
25 447.009 0.90 1.83481 42.73
26 11.964 3.20 1.80809 22.76
27 20.628 Variable
28 30.000 1.40 2.00100 29.13
29 20.227 9.98 1.51593 64.25
30* -30.226 13.77
31 ∞ 4.00 1.51633 64.14
32 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-3.88820e-06,A6=1.87086e-07,A8=-7.95151e-10,A10=1.25527e-12
7th side
k=0.000
A4=-2.77730e-05,A6=8.80767e-08,A8=1.51145e-09,A10=-7.73362e-12,
A12=1.53630e-14, A14=-1.43758e-16
14th surface
k=0.000
A4=-1.05694e-05,A6=-6.45470e-08,A8=1.20208e-10,A10=1.00841e-12
15th surface
k=0.000
A4=1.25817e-05,A6=-8.27502e-08,A8=2.56287e-10,A10=6.01735e-13
24th surface
k=0.000
A4=5.60083e-07,A6=1.19957e-08,A8=-8.00000e-11
30th surface
k=0.000
A4=5.86052e-06,A6=-3.89769e-08,A8=5.06557e-11,A10=-1.39335e-13

Zoom data
WE ST TE
f 12.36 34.63 98.01
FNO. 4.08 4.08 4.08
2 ω 82.99 33.72 12.13
BF(in air) 17.21 17.18 17.23
LTL (in air) 136.88 154.11 180.42
d5 0.90 25.97 53.97
d12 38.09 14.02 1.30
d24 2.84 10.91 20.96
d27 3.99 12.18 13.11

Focal length of each group
f1=110.17 f2=-14.38 f3=24.13 f4=-25.30 f5=39.22

Numerical Example 14
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 95.949 2.50 1.85478 24.80
2 68.626 7.09 1.49700 81.54
3 -8377.942 0.15
4 61.585 5.04 1.49700 81.54
5 177.353 Variable
6* 716.535 1.65 1.88227 37.18
7* 15.145 7.37
8 -21.580 1.00 1.59282 68.62
9 36.981 4.78 2.00069 25.46
10 -38.844 1.28
11 -22.082 1.20 1.83481 42.73
12 -49.197 Variable
13 (Aperture) ∞ 1.50
14* 23.676 4.56 1.58253 59.32
15* -439.208 4.90
16 172.588 3.04 1.49700 81.54
17 -41.929 0.50
18 81.016 1.00 1.91082 35.25
19 17.182 4.64 1.49700 81.54
20 -209.248 1.20
21 28.562 0.80 1.85478 24.80
22 21.421 4.20 1.58253 59.32
23* -116.583 Variable
24 287.459 0.90 1.83481 42.73
25 11.939 2.98 1.80809 22.76
26 19.021 Variable
27 30.000 1.20 2.00100 29.13
28 20.470 9.99 1.51593 64.25
29* -30.111 13.36
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=2.05267e-07,A6=1.11693e-07,A8=-4.56214e-10,A10=7.21619e-13
7th side
k=0.000
A4=-1.92544e-05,A6=7.37941e-08,A8=-2.92949e-11,A10=1.49465e-11,
A12=-1.61994e-13,A14=5.47982e-16
14th surface
k=0.000
A4=-1.28520e-05,A6=-7.10602e-08,A8=1.20613e-10,A10=-1.29681e-13
15th surface
k=0.000
A4=8.98467e-06,A6=-9.15893e-08,A8=2.91742e-10,A10=-8.64068e-13
Surface 23
k=0.000
A4=3.12260e-06,A6=1.05725e-08,A8=-8.00000e-11
29th surface
k=0.000
A4=4.74827e-06,A6=-4.34195e-08,A8=6.95050e-11,A10=-1.89705e-13

Zoom data
WE ST TE
f 12.36 34.63 98.00
FNO. 4.08 4.08 4.08
2 ω 83.00 33.71 12.14
BF(in air) 16.79 16.78 16.82
LTL (in air) 135.67 153.96 179.58
d5 0.80 26.73 54.10
d12 37.38 14.09 1.30
d23 3.28 10.98 21.27
d26 3.97 11.93 12.63

Focal length of each group
f1=110.71 f2=-14.03 f3=23.69 f4=-23.98 f5=38.77

Numerical Example 15
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 93.583 2.50 1.85478 24.80
2 67.801 7.15 1.49700 81.54
3 ∞ 0.15
4 61.858 4.97 1.49700 81.54
5 174.464 Variable
6* 287.786 1.65 1.88227 37.18
7* 14.613 7.38
8 -23.154 1.00 1.59282 68.63
9 31.923 4.85 2.00069 25.46
10 -43.491 1.35
11 -22.987 1.20 1.83481 42.71
12 -55.345 variable
13 (Aperture) ∞ 1.50
14* 24.239 4.37 1.58253 59.32
15* -431.399 4.59
16 52.169 3.55 1.43875 94.93
17 -51.001 0.10
18 43.970 1.00 1.91082 35.25
19 15.684 3.73 1.49700 81.54
20 46.399 1.10
21 25.066 0.80 1.85478 24.80
22 17.519 4.99 1.58253 59.32
23* -71.142 variable
24 110.789 0.90 1.83481 42.71
25 11.274 3.07 1.80810 22.76
26 17.325 Variable
27 30.229 1.20 2.00100 29.13
28 21.475 9.15 1.51593 64.25
29* -32.812 Variable
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=2.25898e-07,A6=4.22819e-08,A8=-8.98072e-11,A10=1.00869e-13
7th side
k=0.000
A4=-1.88770e-05,A6=-6.85675e-09,A8=2.53859e-10,A10=-1.95293e-12,
A12=2.06991e-14
14th surface
k=0.000
A4=-1.05225e-05, A6=-1.99885e-08, A8=-3.85739e-11, A10=3.64450e-13
15th surface
k=0.000
A4=1.05698e-05, A6=-3.47712e-08, A8=7.58436e-11
Surface 23
k=0.000
A4=7.69926e-06,A6=8.54623e-10,A8=-3.49269e-11
29th surface
k=0.000
A4=2.60150e-06,A6=-5.83870e-08,A8=1.49538e-10,A10=-3.65912e-13

Zoom data
WE ST TE
f 12.36 34.63 97.98
FNO. 4.07 4.08 4.08
2 ω 83.00 33.76 12.14
BF(in air) 15.97 15.50 14.55
LTL(in air) 132.66 148.69 175.54
d5 0.75 24.75 53.60
d12 36.27 13.05 1.30
d23 2.47 10.80 21.04
d26 4.96 12.34 12.80
d29 12.51 12.08 11.08

Focal length of each group
f1=110.44 f2=-13.94 f3=23.09 f4=-24.46 f5=39.46

Numerical Example 16
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 95.079 2.50 1.85478 24.80
2 68.232 7.15 1.49700 81.54
3 -3617.707 0.15
4 61.430 4.97 1.49700 81.54
5 170.088 Variable
6* 258.176 1.65 1.88227 37.18
7* 14.511 7.55
8 -21.242 1.00 1.43875 94.93
9 37.222 3.80 1.92286 20.88
10 -89.968 1.65
11 -23.138 1.20 1.88300 40.76
12 -35.361 Variable
13 (Aperture) ∞ 1.50
14* 25.480 4.11 1.58253 59.32
15* -428.292 5.56
16 49.370 3.66 1.43875 94.93
17 -50.004 0.10
18 48.458 1.00 1.91082 35.25
19 16.450 3.59 1.49700 81.54
20 50.864 1.10
21 25.537 0.80 1.85478 24.80
22 17.931 4.94 1.58253 59.32
23* -72.348 Variable
24 97.559 0.90 1.83481 42.71
25 11.406 3.10 1.80810 22.76
26 17.138 Variable
27 30.229 1.20 2.00100 29.13
28 21.727 9.00 1.51593 64.25
29*-35.062 variable
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-1.59702e-06,A6=4.07266e-08,A8=-3.08315e-11,A10=-4.51690e-14
7th side
k=0.000
A4=-2.16368e-05, A6=-1.80689e-08, A8=2.53431e-10, A10=-2.20429e-12,
A12=3.51364e-14
14th surface
k=0.000
A4=-7.98350e-06,A6=-2.95058e-08,A8=4.84105e-11,A10=-6.17600e-14
15th surface
k=0.000
A4=1.15167e-05,A6=-3.59430e-08,A8=5.13666e-11
Surface 23
k=0.000
A4=7.42561e-06,A6=2.63480e-09,A8=-2.84963e-11
29th surface
k=0.000
A4=1.81113e-06,A6=-6.95321e-08,A8=2.31304e-10,A10=-5.68376e-13

Zoom data
WE ST TE
f 12.36 34.63 97.97
FNO. 4.08 4.07 4.08
2 ω 82.99 33.81 12.15
BF(in air) 16.20 15.31 14.36
LTL (in air) 133.38 149.38 176.01
d5 0.76 24.64 53.60
d12 36.87 13.35 1.30
d23 2.80 11.28 21.67
d26 4.57 12.63 12.90
d29 12.74 11.88 10.90

Focal length of each group
f1=110.30 f2=-14.01 f3=23.63 f4=-24.86 f5=40.53

Numerical Example 17
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 94.396 2.50 1.85478 24.80
2 68.283 7.10 1.49700 81.54
3 -13762.746 0.15
4 61.694 4.92 1.49700 81.54
5 169.527 Variable
6* 255.318 1.65 1.88227 37.18
7* 14.243 7.50
8 -21.189 1.00 1.59282 68.63
9 35.053 4.47 2.05023 27.00
10 -36.266 1.10
11 -21.767 1.20 1.83481 42.71
12 -56.277 Variable
13 (Aperture) ∞ 1.50
14* 23.219 4.51 1.58253 59.32
15* -660.457 4.17
16 65.382 3.44 1.49 700 81.54
17 -53.694 0.45
18 54.655 1.00 1.91082 35.25
19 15.446 3.97 1.49700 81.54
20 69.236 1.20
21 25.201 0.80 1.85478 24.80
22 18.092 4.84 1.58253 59.32
23* -70.149 Variable
24 213.860 0.90 1.83481 42.71
25 11.484 3.10 1.80810 22.76
26 18.898 Variable
27 30.229 1.20 2.00100 29.13
28 20.202 9.62 1.51593 64.25
29* -30.260 12.69
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-1.04869e-05,A6=1.54782e-07,A8=-5.55781e-10,A10=8.46666e-13
7th side
k=0.000
A4=-3.52903e-05, A6=8.36972e-08, A8=-3.35235e-10, A10=6.98324e-12,
A12=-4.01323e-14
14th surface
k=0.000
A4=-1.13226e-05,A6=-1.21642e-08,A8=-2.28856e-10,A10=9.52724e-13
15th surface
k=0.000
A4=9.93458e-06,A6=-3.15931e-08,A8=-6.14539e-12
Surface 23
k=0.000
A4=8.35105e-06,A6=-5.28477e-09,A8=8.37223e-12
29th surface
k=0.000
A4=4.41962e-06,A6=-6.03687e-08,A8=1.88526e-10,A10=-6.28225e-13

Zoom data
WE ST TE
f 12.36 34.63 97.99
FNO. 4.08 4.08 4.07
2 ω 83.00 33.67 12.10
BF(in air) 16.14 16.12 16.17
LTL (in air) 133.74 149.74 176.36
d5 0.78 25.00 54.27
d12 37.63 13.67 1.30
d23 2.55 10.27 19.82
d26 4.35 12.39 12.51

Focal length of each group
f1=111.21 f2=-14.35 f3=23.28 f4=-24.40 f5=39.60

Numerical Example 18
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 90.000 2.25 1.85478 24.80
2 65.454 7.76 1.49700 81.54
3 20927.998 0.15
4 59.213 5.26 1.49700 81.54
5 171.192 Variable
6* -5028.066 1.50 1.88202 37.22
7* 15.068 7.45
8 -20.468 1.00 1.61800 63.40
9 36.320 6.00 2.00069 25.46
10 -35.963 2.38
11 -19.044 1.00 1.88300 40.76
12 -34.702 Variable
13 (Aperture) ∞ 1.50
14* 21.251 6.66 1.58313 59.38
15* 11979.842 1.33
16 39.852 3.68 1.49700 81.54
17 -45.826 0.40
18 60.222 1.00 1.91082 35.25
19 14.439 3.01 1.49700 81.54
20 30.786 1.20
21 22.835 0.80 1.85478 24.80
22 17.035 5.25 1.58313 59.38
23* -46.877 Variable
24 204.227 0.90 1.83481 42.73
25 10.978 3.15 1.80809 22.76
26 18.341 Variable
27* 62.161 8.73 1.49700 81.54
28 -16.373 1.30 2.00100 29.13
29 -21.214 12.74
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-1.27605e-07,A6=1.05520e-07,A8=-3.98597e-10,A10=6.60399e-13
7th side
k=0.000
A4=-2.44732e-05, A6=4.79428e-08, A8=4.13990e-10, A10=-1.35460e-12
14th surface
k=0.000
A4=-9.32034e-06,A6=-2.28948e-08,A8=-1.25381e-11
15th surface
k=0.000
A4=2.52025e-05, A6=-3.19289e-08, A8=2.30417e-11
Surface 23
k=0.000
A4=8.61500e-06, A6=2.20310e-08
27th surface
k=0.000
A4=-5.27238e-06,A6=4.45361e-08,A8=-5.86662e-11

Zoom data
WE ST TE
f 12.24 34.63 97.92
FNO. 4.06 4.03 4.05
2 ω 83.54 33.74 12.12
BF(in air) 16.20 16.16 16.20
LTL (in air) 131.57 147.05 173.58
d5 0.60 23.25 53.47
d12 34.23 11.77 1.30
d23 2.40 9.43 16.00
d26 4.48 12.78 12.94

Focal length of each group
f1=105.23 f2=-13.45 f3=21.92 f4=-23.71 f5=41.17

Numerical Example 19
Unit: mm

Surface data Surface number rd nd νd
Object ∞ ∞
1 90.000 2.30 1.85478 24.80
2 65.592 7.38 1.49 700 81.54
3 ∞ 0.15
4 59.096 5.13 1.49700 81.54
5 173.762 Variable
6* 464.875 1.50 1.88202 37.22
7* 14.784 7.45
8 -20.119 1.20 1.61800 63.40
9 35.728 5.00 2.00069 25.46
10 -33.690 1.91
11 -19.739 1.30 1.88300 40.76
12 -42.267 Variable
13 (Aperture) ∞ 1.50
14* 23.000 5.00 1.58313 59.38
15* -262.448 3.26
16 43.079 3.72 1.49700 81.54
17 -41.898 0.40
18 85.095 1.00 1.91082 35.25
19 15.097 3.28 1.49700 81.54
20 45.596 1.20
21 23.870 0.80 1.85478 24.80
22 17.905 5.08 1.58313 59.38
23* -53.454 variable
24 155.034 0.90 1.83481 42.73
25 10.571 3.28 1.80809 22.76
26 17.967 Variable
27* 59.278 9.08 1.49700 81.54
28 -17.171 1.30 2.00100 29.13
29 -22.118 12.59
30 ∞ 4.00 1.51633 64.14
31 ∞ 0.80
Image plane ∞

Aspherical data 6th surface
k=0.000
A4=-5.56888e-06,A6=1.34080e-07,A8=-4.47331e-10,A10=6.81629e-13
7th side
k=0.000
A4=-2.85137e-05,A6=6.42427e-08,A8=1.98844e-10,A10=2.26086e-12
14th surface
k=0.000
A4=-5.39823e-06,A6=-2.50029e-08,A8=5.76417e-12
15th surface
k=0.000
A4=2.40146e-05,A6=-2.95811e-08,A8=2.30417e-11
Surface 23
k=0.000
A4=9.69024e-06,A6=1.35975e-08,A8=-1.89268e-12
27th surface
k=0.000
A4=-3.70004e-06,A6=3.88725e-08,A8=-3.74807e-11

Zoom data
WE ST TE
f 12.24 34.63 97.92
FNO. 4.09 4.08 4.08
2 ω 83.61 33.83 12.12
BF(in air) 16.06 16.02 16.04
LTL(in air) 131.59 146.40 172.58
d5 0.60 22.30 51.61
d12 34.93 12.19 1.32
d23 2.39 9.88 17.87
d26 4.49 12.90 12.62

Focal length of each group
f1=104.21 f2=-13.28 f3=22.30 f4=-23.95 f5=41.57

Next, the values of the conditional expressions in each example are listed below.
Example 1 Example 2 Example 3 Example 4
(1)f1G/f2G -7.80 -8.05 -8.22 -7.57
(2) ν22n-ν21n 31.44 31.44 26.18 26.18
(3) νdG2N 68.62 68.62 63.40 63.40
(4)ndG2P 2.00069 2.00069 2.00069 2.00069
(5) νdG2L2N 68.62 68.62 63.40 63.40
(6)ndG2L2N 1.59282 1.59282 1.618 1.618
(7) (β2W/β3W)
/(β2T/β3T) 1.064 1.031 1.403 0.964
(8)f1G/fT 1.128 1.110 1.621 1.083
(9) fG2F/fG2 1.207 1.268 1.224 1.231
(10) (RG21+RG22)
/(RG21-RG22) 0.701 0.503 0.894 0.753
(11) (RG2L1R+RG2L2F)
/(RG2L1R-RG2L2F) -0.229 -0.223 -0.193 -0.162
(12)ndG2CP-ndG2CN 0.408 0.408 0.383 0.383
(13) νdG2CN-νdG2CP 43.16 43.16 37.94 37.94
(14) (RG2R1+RG2R2)
/(RG2R1-RG2R2) -3.164 -2.589 -4.284 -3.517
(15) (RG2r2RR+RG2r1RF)
/(RG2r2RR-RG2r1RF) 2.859 3.155 2.587 3.551
(16) (RG2PF+RG2PR)
/(RG2PF-RG2PR) -0.153 -0.155 -0.082 0.053
(17)fT/ExpT -0.467 -0.490 -0.435 -0.571
(18)f3G/fT 0.238 0.231 0.298 0.239
(19)fIS/fISG 1.607 1.483 1.426 1.405

Example 5 Example 6 Example 7 Example 8
(1)f1G/f2G -8.08 -7.90 -7.85 -7.87
(2) ν22n-ν21n 31.40 31.40 28.52 28.52
(3) νdG2N 68.62 68.62 68.62 68.62
(4)ndG2P 2.00069 2.00069 2.00069 2.00069
(5) νdG2L2N 68.62 68.62 68.62 68.62
(6)ndG2L2N 1.59282 1.59282 1.59282 1.59282
(7) (β2W/β3W)
/(β2T/β3T) 0.986 1.003 0.989 1.004
(8)f1G/fT 1.082 1.109 1.097 1.089
(9) fG2F/fG2 1.280 1.252 1.267 1.288
(10) (RG21+RG22)
/(RG21-RG22) 0.630 0.688 0.748 0.680
(11) (RG2L1R+RG2L2F)
/(RG2L1R-RG2L2F) -0.221 -0.188 -0.222 -0.243
(12)ndG2CP-ndG2CN 0.408 0.408 0.408 0.408
(13) νdG2CN-νdG2CP 43.16 43.16 43.16 43.16
(14) (RG2R1+RG2R2)
/(RG2R1-RG2R2) -2.640 -3.203 -3.210 -2.528
(15) (RG2r2RR+RG2r1RF)
/(RG2r2RR-RG2r1RF) 2.939 2.964 2.579 2.729
(16) (RG2PF+RG2PR)
/(RG2PF-RG2PR) -0.150 -0.069 -0.195 -0.233
(17)fT/ExpT -0.490 -0.489 -0.490 -0.490
(18)f3G/fT 0.230 0.233 0.231 0.228
(19) fIS/fISG 1.511 1.451 1.496 1.507

Example 9 Example 10 Example 11 Example 12
(1)f1G/f2G -7.87 -7.58 -7.96 -7.76
(2) ν22n-ν21n 27.70 26.18 31.45 31.44
(3) νdG2N 68.62 63.40 68.62 68.62
(4)ndG2P 2.00069 2.00069 2.00069 2.00069
(5) νdG2L2N 68.62 63.40 68.62 68.62
(6)ndG2L2N 1.59282 1.618 1.59282 1.59282
(7) (β2W/β3W)
/(β2T/β3T) 1.035 0.922 1.028 1.054
(8)f1G/fT 1.146 1.071 1.115 1.143
(9) fG2F/fG2 1.271 1.249 1.259 1.198
(10) (RG21+RG22)
/(RG21-RG22) 0.762 0.862 0.585 0.975
(11) (RG2L1R+RG2L2F)
/(RG2L1R-RG2L2F) -0.213 -0.134 -0.209 -0.163
(12)ndG2CP-ndG2CN 0.408 0.383 0.408 0.408
(13) νdG2CN-νdG2CP 43.16 37.94 43.16 43.16
(14) (RG2R1+RG2R2)
/(RG2R1-RG2R2) -4.479 -3.810 -2.981 -3.089
(15) (RG2r2RR+RG2r1RF)
/(RG2r2RR-RG2r1RF) 2.282 3.316 2.918 3.632
(16) (RG2PF+RG2PR)
/(RG2PF-RG2PR) -0.183 0.048 -0.153 0.054
(17)fT/ExpT -0.490 -0.501 -0.490 -0.359
(18)f3G/fT 0.240 0.234 0.231 0.246
(19)fIS/fISG 1.403 1.443 1.468 2.735

Example 13 Example 14 Example 15 Example 16
(1)f1G/f2G -7.66 -7.89 -7.92 -7.87
(2) ν22n-ν21n 31.44 31.44 31.45 57.75
(3) νdG2N 68.62 68.62 68.63 94.93
(4)ndG2P 2.00069 2.00069 2.00069 1.92286
(5) νdG2L2N 68.62 68.62 68.63 94.93
(6)ndG2L2N 1.59282 1.59282 1.59282 1.43875
(7) (β2W/β3W)
/(β2T/β3T) 1.028 1.039 1.058 1.047
(8)f1G/fT 1.124 1.130 1.127 1.126
(9) fG2F/fG2 1.183 1.251 1.255 1.248
(10) (RG21+RG22)
/(RG21-RG22) 1.076 0.872 0.677 0.759
(11) (RG2L1R+RG2L2F)
/(RG2L1R-RG2L2F) -0.159 -0.175 -0.226 -0.188
(12)ndG2CP-ndG2CN 0.408 0.408 0.408 0.484
(13) νdG2CN-νdG2CP 43.16 43.16 43.17 74.05
(14) (RG2R1+RG2R2)
/(RG2R1-RG2R2) -3.212 -2.629 -2.421 -4.786
(15) (RG2r2RR+RG2r1RF)
/(RG2r2RR-RG2r1RF) 3.586 3.635 3.242 1.692
(16) (RG2PF+RG2PR)
/(RG2PF-RG2PR) 0.053 -0.025 -0.153 -0.415
(17)fT/ExpT -0.319 -0.365 -0.465 -0.499
(18)f3G/fT 0.246 0.242 0.236 0.241
(19)fIS/fISG 2.300 1.911 1.642 1.629

Example 17 Example 18 Example 19
(1)f1G/f2G -7.75 -7.82 -7.85
(2) ν22n-ν21n 31.45 26.18 26.18
(3) νdG2N 68.63 63.40 63.40
(4)ndG2P 2.05023 2.00069 2.00069
(5) νdG2L2N 68.63 63.40 63.40
(6)ndG2L2N 1.59282 1.618 1.618
(7) (β2W/β3W)
/(β2T/β3T) 1.041 0.864 0.954
(8)f1G/fT 1.135 1.075 1.064
(9) fG2F/fG2 1.195 1.266 1.306
(10) (RG21+RG22)
/(RG21-RG22) 0.639 1.014 0.833
(11) (RG2L1R+RG2L2F)
/(RG2L1R-RG2L2F) -0.196 -0.152 -0.153
(12)ndG2CP-ndG2CN 0.457 0.383 0.383
(13) νdG2CN-νdG2CP 41.63 37.94 37.94
(14) (RG2R1+RG2R2)
/(RG2R1-RG2R2) -2.261 -3.432 -2.752
(15) (RG2r2RR+RG2r1RF)
/(RG2r2RR-RG2r1RF) 4.003 3.251 3.830
(16) (RG2PF+RG2PR)
/(RG2PF-RG2PR) -0.017 0.005 0.029
(17)fT/ExpT -0.445 -0.490 -0.490
(18)f3G/fT 0.238 0.224 0.228
(19)fIS/fISG 1.603 1.379 1.452

FIG. 39 is a cross-sectional view of a single-lens mirrorless camera as an electronic imaging device. In FIG. 39, the photographing optical system 2 is arranged in the lens barrel of the single-lens mirrorless camera 1. The mount unit 3 allows the taking optical system 2 to be attached to and detached from the body of the single-lens mirrorless camera 1. As the mount portion 3, a screw type mount, a bayonet type mount, or the like is used. In this example, a bayonet type mount is used. An image pickup element surface 4 and a back monitor 5 are arranged on the body of the single-lens mirrorless camera 1. A small CCD or CMOS is used as the image pickup device.

Then, as the photographing optical system 2 of the single-lens mirrorless camera 1, for example, the zoom lens shown in each of Examples 1 to 19 is used.

40 and 41 are conceptual diagrams of the configuration of the image pickup apparatus. FIG. 40 is a front perspective view of a digital camera 40 as an imaging device, and FIG. 41 is a rear perspective view of the same. The zoom lens of this embodiment is used as the photographing optical system 41 of the digital camera 40.

The digital camera 40 of this embodiment includes a photographing optical system 41 located on a photographing optical path 42, a shutter button 45, a liquid crystal display monitor 47, etc. When the shutter button 45 arranged on the upper part of the digital camera 40 is pressed, In conjunction with this, photographing is performed through the photographing optical system 41, for example, the zoom lens of the first embodiment. The object image formed by the photographing optical system 41 is formed on the image sensor (photoelectric conversion surface) provided near the image plane. The object image received by the image pickup device is displayed as an electronic image on the liquid crystal display monitor 47 provided on the rear surface of the camera by the processing means. Further, the captured electronic image can be recorded in the storage means.

FIG. 42 is a block diagram showing an internal circuit of a main part of the digital camera 40. In the following description, the above-mentioned processing means includes, for example, the CDS/ADC unit 24, the temporary storage memory 17, the image processing unit 18, and the like, and the storage unit includes the storage medium unit 19 and the like.

As shown in FIG. 42, the digital camera 40 is connected to the operation unit 12, the control unit 13 connected to the operation unit 12, and the control signal output port of the control unit 13 via the buses 14 and 15. The imaging drive circuit 16, the temporary storage memory 17, the image processing unit 18, the storage medium unit 19, the display unit 20, and the setting information storage memory unit 21 are provided.

The temporary storage memory 17, the image processing unit 18, the storage medium unit 19, the display unit 20, and the setting information storage memory unit 21 are capable of mutually inputting and outputting data via the bus 22. Further, the CCD 49 and the CDS/ADC unit 24 are connected to the image pickup drive circuit 16.

The operation unit 12 includes various input buttons and switches, and notifies the control unit 13 of event information input from outside (camera user) via these. The control unit 13 is a central processing unit including, for example, a CPU, has a program memory (not shown) built therein, and controls the entire digital camera 40 according to a program stored in the program memory.

The CCD 49 is an image pickup device which is driven and controlled by the image pickup drive circuit 16 and converts the light amount of each pixel of the object image formed via the photographing optical system 41 into an electric signal and outputs the electric signal to the CDS/ADC unit 24.

The CDS/ADC unit 24 amplifies the electric signal input from the CCD 49, performs analog/digital conversion, and performs only this amplification and digital conversion on raw image data (Bayer data, hereinafter referred to as RAW data). Is output to the temporary storage memory 17.

The temporary storage memory 17 is, for example, a buffer including an SDRAM or the like, and is a memory device that temporarily stores the RAW data output from the CDS/ADC unit 24. The image processing unit 18 reads the RAW data stored in the temporary storage memory 17 or the RAW data stored in the storage medium unit 19, and includes distortion correction based on the image quality parameter designated by the control unit 13. It is a circuit that electrically performs various image processes.

In the storage medium unit 19, for example, a card-type or stick-type recording medium such as a flash memory is detachably mounted, and the RAW data transferred from the temporary storage memory 17 and the image processing unit 18 are loaded in these flash memories. Image-processed image data is recorded and held.

The display unit 20 includes a liquid crystal display monitor 47 and the like, and displays captured RAW data, image data, an operation menu, and the like. The setting information storage memory unit 21 includes a ROM unit that stores various image quality parameters in advance, and a RAM unit that stores the image quality parameters read from the ROM unit by an input operation of the operation unit 12.

The present invention can take various modifications without departing from the spirit of the invention. Further, the number of shapes shown in each of the above embodiments is not necessarily limited. Further, in each of the above embodiments, the cover glass does not necessarily have to be arranged. Further, a lens, which is not shown in the above-mentioned embodiments and has substantially no refracting power, may be arranged inside or outside each lens group.

As described above, the zoom lens according to the present invention has a wide angle of view and a large zoom ratio while being small in size, and is suitable for a zoom lens in which aberrations are satisfactorily corrected and an image pickup apparatus including the zoom lens. .. Further, the zoom lens according to the present invention is suitable for a zoom lens having a small F number and causing less camera shake during shooting at the telephoto end, and an image pickup apparatus including the zoom lens.

G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group G5 Fifth lens group S Brightness stop C Cover glass I Image plane 1 Single-lens mirrorless camera 2 Photographing optical system 3 Lens barrel mount 4 image sensor surface 5 back monitor 12 operation unit 13 control unit 14, 15 bus 16 imaging drive circuit 17 temporary storage memory 18 image processing unit 19 storage medium unit 20 display unit 21 setting information storage memory unit 22 bus 24 CDS/ADC unit 40 Digital camera 41 Photographing optical system 42 Photographing optical path 45 Shutter button 47 Liquid crystal display monitor 49 CCD

Claims (24)

From the object side,
A first lens group having a positive focal length,
A second lens group having a negative focal length,
A third lens group having a positive focal length,
A fourth lens group having a negative focal length,
It consists of a fifth lens group with a positive focal length,
During zooming from the wide-angle end to the telephoto end, an air gap between the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group Change from each other,
The second lens group includes a plurality of lenses,
A configuration including a positive lens, a positive lens, and a cemented lens in order from the object side is included in the third lens group, and the cemented lens includes, in order from the object side, a negative lens and a positive lens,
The fifth lens group includes one negative lens and one positive lens,
A zoom lens characterized by satisfying the following conditional expressions (1 ' ) and (2).
-8.3 ≤ f1G/f2G ≤ -6.5 (1 ' )
22≦ν22n−ν21n≦60 (2)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
ν21n is the Abbe's number at the d-line of the lens having the negative focal length arranged closest to the object in the second lens group,
ν22n is the Abbe's number at the d-line of the second lens having the negative focal length, which is disposed second from the object side of the second lens group with an air gap therebetween,
Is. When zooming from the wide-angle end to the telephoto end
The air gap between the first lens group and the second lens group widens,
The air gap between the second lens group and the third lens group is narrowed,
The air gap between the third lens group and the fourth lens group widens,
The zoom lens according to claim 1, wherein an air gap between the fourth lens group and the fifth lens group is widened. The zoom lens according to claim 1, wherein the following conditional expression (3) is satisfied.
50≦νdG2N (3)
However,
νdG2N is the maximum Abbe number in the d-line of the negative lens arranged in the second lens group,
Is. The zoom lens according to any one of claims 1 to 3, wherein the following conditional expression (4) is satisfied.
1.85≦ndG2P (4)
However,
ndG2P is the maximum refractive index of the positive lenses arranged in the second lens group at the d-line,
Is. The zoom lens according to any one of claims 1 to 4, wherein the following conditional expressions (5) and (6) are satisfied.
55≦νdG2L2N (5)
ndG2L2N≦1.65 (6)
However,
νdG2L2N is the Abbe's number at the d-line of the lens having the negative focal length that is arranged second from the object side of the second lens group with an air gap in between,
ndG2L2N is a refractive index at d line of a lens having a negative focal length, which is arranged second from the object side of the second lens group with an air gap therebetween,
Is. The zoom lens according to claim 1, wherein the following conditional expression (7) is satisfied.
0.6≦(β2W/β3W)/(β2T/β3T)≦1.7 (7)
However,
β2W is the lateral magnification of the second lens group at the wide-angle end,
β3W is the lateral magnification of the third lens group at the wide-angle end,
β2T is the lateral magnification of the second lens group at the telephoto end,
β3T is the lateral magnification of the third lens group at the telephoto end,
Is. The zoom lens according to any one of claims 1 to 6, wherein the following conditional expression (8) is satisfied.
0.85≦f1G/fT≦1.65 (8)
However,
f1G is the focal length of the first lens group,
fT is the focal length of the entire zoom lens system at the telephoto end,
Is. The zoom lens according to any one of claims 1 to 7, which satisfies the following conditional expression (9).
0.2≦fG2F/fG2≦1.35 (9)
However,
fG2F is the focal length of the lens arranged closest to the object in the second lens group,
fG2 is the focal length of the second lens group,
Is. The zoom lens according to any one of claims 1 to 8, which satisfies the following conditional expression (10).
0.2≦(RG21+RG22)/(RG21−RG22)≦1.8 (10)
However,
RG21 is the radius of curvature of the object side surface of the lens arranged closest to the object in the second lens group,
RG22 is the radius of curvature of the image side surface of the lens arranged closest to the image side of the second lens group,
Is. The zoom lens according to claim 1, wherein the following conditional expression (11) is satisfied.
−0.3≦(RG2L1R+RG2L2F)/(RG2L1R−RG2L2F)≦1
(11)
However,
RG2L1R is the radius of curvature of the image side surface of the lens arranged closest to the object side in the second lens group,
RG2L2F is the radius of curvature of the object side surface of the lens that is arranged second from the object side of the second lens group with an air gap in between,
Is. The zoom lens according to any one of claims 1 to 10, wherein the following conditional expression (12) is satisfied.
0.3≦ndG2CP-ndG2CN (12)
However,
ndG2CP is the refractive index at the d-line of the cemented positive lens in the second lens group,
ndG2CN is the refractive index of the cemented negative lens in the second lens group at the d-line,
When the second lens group includes a plurality of cemented lenses,
ndG2CP is the maximum refractive index of the cemented positive lenses at the d-line,
ndG2CN is the minimum refractive index of the cemented negative lenses at the d-line,
Is. The zoom lens according to any one of claims 1 to 11, characterized by satisfying the following conditional expression (13).
25≦νdG2CN−νdG2CP (13)
However,
νdG2CP is the Abbe number at the d line of the positive lens that is cemented in the second lens group,
νdG2CN is the Abbe number at the d line of the cemented negative lens in the second lens group, and when the second lens group includes a plurality of cemented lenses,
νdG2CP is the minimum Abbe number among the Abbe numbers at the d line of the cemented positive lens,
νdG2CN is the maximum Abbe number among the Abbe numbers at the d line of the cemented negative lens,
Is. The zoom lens according to any one of claims 1 to 12, characterized by satisfying the following conditional expression (14).
−5≦(RG2R1+RG2R2)/(RG2R1-RG2R2)≦−2 (14)
However,
RG2R1 is the radius of curvature of the object side surface of the lens disposed closest to the image side in the second lens group,
RG2R2 is the radius of curvature of the image side surface of the lens arranged closest to the image in the second lens group. The zoom lens according to any one of claims 1 to 13, wherein the following conditional expression (15) is satisfied.
1.5≦(RG2r2RR+RG2r1RF)/(RG2r2RR-RG2r1RF)
≦4.5 (15)
However,
RG2r2RR is the radius of curvature of the image side surface of the lens that is arranged second from the image side of the second lens group with an air gap in between,
RG2r1RF is the radius of curvature of the object side surface of the lens arranged closest to the image side in the second lens group,
Is. 15. The zoom lens according to claim 1, wherein the zoom lens satisfies the following conditional expression (16).
-0.5≤(RG2PF+RG2PR)/(RG2PF-RG2PR)≤0.5 (16)
However,
RG2PF is the radius of curvature of the object side surface of the positive lens disposed closest to the image side in the second lens group,
RG2PR is the radius of curvature of the image side surface of the positive lens arranged closest to the image side of the second lens group,
Is. The zoom lens according to any one of claims 1 to 15, wherein the following conditional expression (17) is satisfied.
−2.5≦fT/ExpT≦0.3 (17)
However,
fT is the focal length of the entire zoom lens system at the telephoto end,
ExpT is the paraxial image plane reference exit pupil position at the telephoto end,
Is. The zoom lens according to any one of claims 1 to 16, wherein the zoom lens satisfies the following conditional expression (18).
0.2≦f3G/fT≦0.33 (18)
However,
f3G is the focal length of the third lens group,
fT is the focal length of the entire zoom lens system at the telephoto end,
Is. It has a moving lens that moves in the direction perpendicular to the optical axis,
The zoom lens according to any one of claims 1 to 17, characterized in that the following conditional expression (19) is satisfied.
1.2≦fIS/fISG≦3 (19)
However,
fIS is the focal length of the moving lens,
fISG is the focal length of the lens group having the moving lens,
Is. The zoom lens according to any one of claims 1 to 18, wherein the lenses arranged in the third lens group are moved in a direction perpendicular to the optical axis. 20. The zoom lens according to claim 1, wherein the zoom lens satisfies the following conditional expression (1″).
−8.22≦f1G/f2G≦−6.5 (1″)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
Is. From the object side,
A first lens group having a positive focal length,
A second lens group having a negative focal length,
A third lens group having a positive focal length,
A fourth lens group having a negative focal length,
It consists of a fifth lens group with a positive focal length,
At the time of zooming from the wide-angle end to the telephoto end, the air gap between the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group. Change from each other,
The second lens group includes a plurality of lenses,
A configuration including a positive lens, a positive lens, and a cemented lens in order from the object side is included in the third lens group, and the cemented lens includes, in order from the object side, a negative lens and a positive lens,
The fifth lens group includes one negative lens and one positive lens,
A zoom lens characterized by satisfying the following conditional expressions (1), (2), and (8).
−8.5≦f1G/f2G≦−6.5 (1)
22≦ν22n−ν21n≦60 (2)
0.85≦f1G/fT≦1.65 (8)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
ν21n is the Abbe's number at the d-line of the lens having the negative focal length arranged closest to the object in the second lens group,
ν22n is the Abbe's number at the d-line of the second lens having the negative focal length, which is disposed second from the object side of the second lens group with an air gap therebetween,
fT is the focal length of the entire zoom lens system at the telephoto end,
Is. From the object side,
A first lens group having a positive focal length,
A second lens group having a negative focal length,
A third lens group having a positive focal length,
A fourth lens group having a negative focal length,
It consists of a fifth lens group with a positive focal length,
At the time of zooming from the wide-angle end to the telephoto end, the air gap between the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group. Change from each other,
The second lens group includes a plurality of lenses,
A configuration including a positive lens, a positive lens, and a cemented lens in order from the object side is included in the third lens group, and the cemented lens includes, in order from the object side, a negative lens and a positive lens,
The fifth lens group includes one negative lens and one positive lens,
A zoom lens characterized by satisfying the following conditional expressions (1), (2), and (9).
−8.5≦f1G/f2G≦−6.5 (1)
22≦ν22n−ν21n≦60 (2)
0.2≦fG2F/fG2≦1.35 (9)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
ν21n is the Abbe's number at the d-line of the lens having the negative focal length arranged closest to the object in the second lens group,
ν22n is the Abbe's number at the d-line of the second lens having the negative focal length, which is disposed second from the object side of the second lens group with an air gap therebetween,
fG2F is the focal length of the lens arranged closest to the object in the second lens group,
Is. From the object side,
A first lens group having a positive focal length,
A second lens group having a negative focal length,
A third lens group having a positive focal length,
A fourth lens group having a negative focal length,
It consists of a fifth lens group with a positive focal length,
At the time of zooming from the wide-angle end to the telephoto end, the air gap between the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group. Change from each other,
The second lens group includes a plurality of lenses,
A configuration including a positive lens, a positive lens, and a cemented lens in order from the object side is included in the third lens group, and the cemented lens includes, in order from the object side, a negative lens and a positive lens,
The fifth lens group includes one negative lens and one positive lens,
A zoom lens that satisfies the following conditional expressions (1), (2), and (18).
−8.5≦f1G/f2G≦−6.5 (1)
22≦ν22n−ν21n≦60 (2)
0.2≦f3G/fT≦0.33 (18)
However,
f1G is the focal length of the first lens group,
f2G is the focal length of the second lens group,
ν21n is the Abbe's number at the d-line of the lens having the negative focal length arranged closest to the object in the second lens group,
ν22n is the Abbe's number at the d-line of the second lens having the negative focal length, which is disposed second from the object side of the second lens group with an air gap therebetween,
f3G is the focal length of the third lens group,
fT is the focal length of the entire zoom lens system at the telephoto end,
Is. A zoom lens according to any one of claims 1 to 23,
An image pickup device comprising: an image pickup element that converts an image formed by the zoom lens into an electric signal.

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