JP2015166790A - Zoom lens and optical device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens which offers a high magnification of 25x or higher and a reduced retracted thickness achieved by reducing the total optical length at the telephoto end, and to provide an optical device having the same.SOLUTION: A zoom lens comprises, in order from the object side to the image side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having negative refractive power, and succeeding groups including a group having positive refractive power, where the second lens group has at least one negative lens and at least one positive lens. Displacement M1, M2 of the first lens group and second lens group, respectively, while zooming, and lateral magnifications β2w, β2t of the second lens group at the wide angle end and telephoto end, respectively, are each appropriately set.

Description

  The present invention relates to a zoom lens and an optical apparatus having the same, and is particularly suitable for a zoom lens used in a digital still camera, a film camera, and a video camera and an image pickup apparatus having the same.

  In recent years, digital still cameras, video cameras, and the like using solid-state image sensors have been increasing in angle and magnification. In particular, digital still cameras are required to reduce the number of lenses and shorten the optical total length when telephoto so that the thickness when retracted is reduced.

  As a zoom lens that meets these requirements, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, a positive lens A zoom lens having a subsequent lens group including a group having refractive power is known.

  Patent Documents 1 and 2 are proposed as examples of a zoom lens having a subsequent lens group including a positive group, a negative group, a negative group, and a positive group. These zoom lenses are designed to shorten the total optical length by increasing the power of the first lens group.

JP 2011-39260 A JP 2013-101238 A

  However, these zoom lenses have a magnification of about 10 to 20 times, and the angle of view at the wide-angle end is narrow, so it cannot always be said that the zoom lens is sufficiently sufficient for increasing the magnification and widening in recent years.

  SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and aims to provide a zoom lens that has a higher magnification than before, that has a shorter optical total length at the telephoto end and a thinner collapsible thickness, and an optical device using the same. .

The zoom lens of the present invention is
A. Subsequent including a first lens group having a positive refractive power in order from the object side to the image side, a second lens group having a negative refractive index, a third lens group having a negative refractive power, and a group having a positive refractive power A group of
B. The second lens group has at least one negative lens and one positive lens,
C. The following conditional expressions are satisfied when the moving amounts of the first and second lens units at zooming are M1 and M2, respectively, and the lateral magnification at the wide-angle end and telephoto end of the second lens unit is β2w and β2t. It is to be. Here, in M1 and M2, the amount of movement toward the object side is −, and the amount of movement toward the image side is +.
−8.0 <M1 / M2 <−2.5
7.0 <β2t / β2w <16.0

  According to the present invention, a zoom lens having a high magnification of 25 times or more, a shortened optical total length at the telephoto end, and a reduced retractable thickness, and an optical apparatus using the zoom lens can be obtained.

Cross-sectional view of the zoom lens of Embodiment 1 at the wide-angle end Aberration diagram at the wide-angle end of the zoom lens of Example 1 Aberration diagram in the middle of the zoom lens of Example 1 Aberration diagram at the telephoto end of the zoom lens of Example 1 Lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 2 Aberration diagram at the wide-angle end of the zoom lens of Example 2 Aberration diagram in the middle of the zoom lens of Example 2 Aberration diagram at the telephoto end of the zoom lens of Example 2 Lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 3 Aberration diagram at the wide-angle end of the zoom lens of Example 3 Aberration diagram in the middle of zoom lens of Example 3 Aberration diagram at the telephoto end of the zoom lens of Example 3 Lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 4 Aberration diagram at the wide-angle end of the zoom lens of Example 4 Aberration diagram in the middle of zoom lens of Example 4 Aberration diagram at the telephoto end of the zoom lens of Example 4 Cross-sectional view of the zoom lens of Example 5 at the wide-angle end Aberration diagram at the wide-angle end of the zoom lens in Example 5 Aberration diagram in the middle of zoom lens of Example 5 Aberration diagram at the telephoto end of the zoom lens of Example 5 Cross-sectional view of the zoom lens of Example 6 at the wide-angle end Aberration diagram at the wide-angle end of the zoom lens in Example 6 Aberration diagram in the middle of zoom lens of Example 6 Aberration diagram at the telephoto end of the zoom lens of Example 6 Cross-sectional view of the zoom lens of Example 7 at the wide-angle end Aberration diagram at the wide-angle end of the zoom lens in Example 7 Aberration diagram in the middle of zoom lens of Example 7 Aberration diagram at the telephoto end of the zoom lens in Example 7 Device diagram of optical equipment (digital still camera) equipped with the zoom lens

  The zoom lens according to the present invention has a high magnification of 25 times or more, shortens the total optical length at the telephoto end, and reduces the thickness of the retractable lens. There are a negative lead type in which the negative group is the front lens group and a positive lead type in which the positive group is the front lens group. The positive lead type is adopted in this configuration in order to cope with higher magnification.

  A positive lead zoom lens mainly obtains a magnification by keeping a distance between a positive group of the first lens group and a negative group of the second lens group which is a variable power group. When the magnification is increased, the distance between the first lens group and the second lens group is widened, so that the total optical length increases when telephoto and the retractable thickness tends to increase. Therefore, the zoom lens of the present invention is characterized in that the retractable thickness is reduced by making the group in front of the stop compact when telephoto. Here, in the zoom lens of the present invention, a stop is disposed in the fourth lens group.

  In order to make the group in front of the aperture compact, it is sufficient to increase the power of each group. However, when the magnification is increased, aberration variation becomes large, and aberration correction becomes difficult. Therefore, in order to reduce the lens diameter of the front group, the negative group of the main zoom group is arranged on the image side of the negative group, which is a positive, negative, negative, and subsequent group. By making the third lens group a negative group, the combined focal length after the third lens group becomes closer to the telephoto, so the angle of the off-axis light beam on the front side from the third lens group becomes smaller, and the first lens group and the second lens The group can be downsized.

  In addition, since the off-axis ray angle is reduced, the off-axis ray height passing through the first lens group and the second lens group can be reduced to prevent the occurrence of higher-order aberrations. It is possible to increase the magnification while suppressing the amount of movement of each lens group while strengthening.

  As described above, the power of the second lens group has been increased for miniaturization, and since the occurrence of chromatic aberration of magnification is particularly large, it is possible to generate chromatic aberration of magnification by having at least one negative lens and one positive lens. Is suppressed.

The zoom lens of the present invention has a high magnification of 25 times or more, and in order to provide a zoom lens and an optical apparatus having the zoom lens in which the retractable thickness is reduced by shortening the optical total length at the telephoto end. . Subsequent including a first lens group having a positive refractive power in order from the object side to the image side, a second lens group having a negative refractive index, a third lens group having a negative refractive power, and a group having a positive refractive power A group of
B. The second lens group has at least one negative lens and one positive lens,
C. The following conditional expressions are satisfied when the moving amounts of the first and second lens units at zooming are M1 and M2, respectively, and the lateral magnification at the wide-angle end and telephoto end of the second lens unit is β2w and β2t. It is to be. Here, in M1 and M2, the amount of movement toward the object side is −, and the amount of movement toward the image side is +.
−8.0 <M1 / M2 <−2.5− (1)
7.0 <β2t / β2w <16.0-(2)
Conditional expression (1) is a conditional expression related to the movement amount ratio between the first lens group and the second lens group, and is mainly a conditional expression related to size. If the lower limit of the conditional expression is not reached, the amount of movement of the first lens unit increases, and the total optical length at the telephoto end increases. On the other hand, if the upper limit is exceeded, the amount of movement of the second lens group increases, which is advantageous for obtaining a zoom ratio, but it is difficult to suppress fluctuations in the field curvature during zooming.

  Conditional expression (2) is a conditional expression related to the variable magnification sharing of the second lens group, and is a conditional expression related to the optical total length and the aberration variation during the variable magnification. If the lower limit of the conditional expression is not reached, the variable magnification share of the second lens group becomes small, which is disadvantageous for higher magnification. Further, it is not preferable because the movement amount of the succeeding group is increased in order to obtain a zoom ratio, and the optical total length is increased. On the other hand, exceeding the upper limit of the conditional expression is advantageous for higher magnification because the second lens group's variable magnification increases, but it is useful for correcting variations in various aberrations such as field curvature and coma during zooming. It becomes difficult.

  In each numerical example, it is more preferable to set the numerical ranges of the conditional expressions (1) and (2) as follows in terms of aberration correction.

−7.8 <M1 / M2 <−2.7− (1a)
7.2 <β2t / β2w <15.5 − (2a)
More preferably, the numerical range of conditional expression (1) is set as follows.

−7.5 <M1 / M2 <−3.0− (1b)
7.5 <β2t / β2w <15.0-(2b)
The object of the present invention is achieved by the above conditional expression, but more preferably, in this configuration, when the focal length of the first lens group is f1 and the focal length of the wide angle end is fw,
6.5 <f1 / fw <10.0-(3)
It is to satisfy the following conditional expression.

  Conditional expression (3) is a conditional expression related to the power of the first lens group, and particularly a conditional expression related to the on-axis aberration on the telephoto side. If the lower limit value of the conditional expression is not reached, the power of the positive lens in the first lens group increases, which is advantageous for downsizing, but it is difficult to correct spherical aberration and axial chromatic aberration on the telephoto side. On the other hand, if the value exceeds the upper limit, the power of the positive lens in the first lens group becomes weak, which is advantageous for making the first lens group thinner and correcting on-axis aberrations on the telephoto side. This is not preferable because the amount increases and the thickness at the time of collapse increases.

As above, more preferably, in the configuration, the subsequent lens group has a fourth lens group, and when the amount of movement of the fourth lens group at the time of zooming is M4,
-6.0 <M4 / fw <-3.5-(4)
It is to satisfy the following conditional expression. Here, in M4, the amount of movement toward the object side is-, and the amount of movement toward the image side is +.

  Conditional expression (4) is a conditional expression related to the amount of movement of the fourth lens unit, and in particular, is a conditional expression related to the aberration variation and the total optical length during zooming. If the lower limit value of the conditional expression is not reached, the amount of movement of the fourth lens group increases, which is advantageous for increasing the magnification. However, it is not preferable because the optical total length increases. In addition, it is difficult to suppress variations in field curvature and coma during zooming. On the other hand, if the value exceeds the upper limit, the amount of movement of the fourth lens group is shortened, which is advantageous for downsizing the total optical length.However, it is difficult to suppress axial chromatic aberration and spherical aberration on the wide angle side by increasing the power. Become.

As above, more preferably, in this configuration, the fourth lens group has a positive refractive power, and when the lateral magnification at the wide angle end and the telephoto end is β4t, β4w,
1.0 <β4t / β4w <5.0-(5)
It is to satisfy the following conditional expression.

  Conditional expression (5) is a conditional expression related to the variable magnification sharing of the fourth lens group, and is a conditional expression related to the front lens diameter and the aberration variation at the time of variable magnification. If the lower limit value of the conditional expression is not reached, the variable magnification share of the fourth lens group becomes small, which is disadvantageous for higher magnification. In addition, the amount of movement of the second lens group is increased in order to increase the zoom ratio, which increases the front lens diameter, which is not preferable. On the other hand, exceeding the upper limit of the conditional expression is advantageous for higher magnification because of the increased share of magnification of the fourth lens group, but it is difficult to correct axial chromatic aberration and coma variation during zooming. Become.

As above, more preferably, in this configuration, when the combined focal length at the wide angle end of the subsequent lens group is fre,
3.1 <fre / fw <7.0-(6)
It is to satisfy the following conditional expression.

  Conditional expression (6) is a conditional expression related to the focal length of the subsequent lens group, and in particular, is a conditional expression related to the size. If the lower limit value of the conditional expression is not reached, the focal length of the subsequent lens group is shortened and the power is increased, which is advantageous for shortening the total optical length, but it is difficult to correct axial chromatic aberration and coma aberration on the wide angle side. On the other hand, exceeding the upper limit is advantageous for reducing the lens diameter of the front group because the focal length of the subsequent lens group is long, but the power of the front group is strengthened for widening the angle, and the image at the time of zooming is increased. It becomes difficult to suppress fluctuations in surface curvature.

As above, more preferably, in the configuration, the fourth lens group has a plurality of positive lenses, and when the average Abbe number of the positive lenses in the fourth lens group is ν4p,
ν4p> 70 − (7)
It is to satisfy the following conditional expression.

  Conditional expression (7) is a conditional expression regarding the glass material of the positive lens of the fourth lens group, and in particular, is a conditional expression regarding chromatic aberration in the entire zooming range. Below the lower limit of the conditional expression, the anomalous dispersion characteristic is small, and it becomes difficult to suppress the secondary dispersion on the telephoto side when the magnification is increased. Further, it is difficult to suppress the axial chromatic aberration fluctuation at the time of zooming.

As above, more preferably, in this configuration, when the average refractive index of the second lens group is N2ave,
N2ave> 1.85-(8)
It is to satisfy the following conditional expression.

  Conditional expression (8) is a conditional expression related to the glass material of the second lens group, and in particular, is a conditional expression related to the field curvature fluctuation at the time of zooming. If the lower limit value of the conditional expression is not reached, the refractive index of the lens included in the negative group becomes small, and the Petzval sum becomes negative, which makes it difficult to suppress fluctuations in field curvature due to zooming. In addition, the curvature of each lens constituting the second lens group becomes tight, and it is particularly difficult to suppress coma.

In each numerical example, it is more preferable to set the numerical ranges of the conditional expressions (3) to (8) as follows for aberration correction.
7.0 <f1 / fw <9.5-(3a)
−5.8 <M4 / fw <−3.7− (4a)
1.1 <β4t / β4w <4.5-(5a)
3.3 <fre / fw <6.9-(6a)
ν4p> 72 − (7a)
N2ave> 1.86-(8a)

More preferably, the numerical ranges of the conditional expressions (3) to (8) are set as follows.
7.5 <f1 / fw <9.0-(3b)
−5.5 <M4 / fw <−4.0− (4b)
1.2 <β4t / β4w <4.0-(5b)
3.5 <fre / fw <6.8-(6b)
74 <ν4p <96-(7b)
1.88 <N2ave <2.2-(8b)
Further, at the time of shooting, the whole or a part of the fourth lens unit L4 is moved in the direction perpendicular to the optical axis to shift the image in the straight direction with respect to the optical axis. This corrects blurring of the captured image when the entire optical system vibrates.

  The third lens group L3 may have a reflecting member for bending the optical path. As a result, some lens groups are retracted from the optical axis, which contributes to a reduction in thickness when retracted.

  In the zoom lens of each numerical example, correction of distortion among various aberrations may be corrected by electrical image processing. In particular, the wide-angle side contributes to the reduction of the front lens diameter by making the imaging range smaller than the effective imaging range of the sensor and correcting the distortion aberration.

  In each numerical example, by configuring each lens group as described above, the zoom lens has a high magnification of 25 times or more, the optical total length at the telephoto end is shortened, and the retractable thickness is reduced, and the optical apparatus having the zoom lens Is obtained.

  Embodiments (numerical examples) of a zoom lens according to the present invention will be described below with reference to the drawings.

In the following description and drawings, ri is the radius of curvature of the i-th surface from the object side, di is the surface interval between the i-th surface and the i + 1-th surface from the object side, and ni is the i-th lens. The refractive index at the d-line, ni, indicates the Abbe number at the d-line of the i-th lens. In addition, k is a conic constant, A4, A6, and A8 are fourth-order, sixth-order, and eighth-order aspheric coefficients, and the displacement in the optical axis direction at the height h from the optical axis is based on the vertex of the surface. When X is defined, the aspheric shape is
X = (h ² / R) / [1+ [1- (1 + K) (h / R) ² ] ^1/2 ] + A4h ⁴ + A6h ⁶ + A8h ⁸
Is displayed. Here, R is a radius of curvature, and “e−X” means “× 10 ^−X ”. For aspheric surfaces, an asterisk (*) is attached to the right side of the surface number in each table.

  Next, the lens configuration of each lens group will be described.

  In Numerical Examples 1 to 7, in order from the object side to the image side, the first lens unit having a positive refractive power, the second lens unit having a negative refractive power, the third lens unit having a negative refractive power, and the first lens unit having a positive refractive power It is composed of a four lens group, a fifth lens group having a negative refractive power, and a sixth lens group having a positive refractive power.

  The first lens unit L1 includes a cemented lens obtained by cementing a negative lens and a positive lens, and a single meniscus positive lens having a convex object side surface. In the zoom lens of each numerical example, the refractive power of the first lens unit L1 is increased within an appropriate range in order to reduce the size. When the refracting power is increased, various aberrations that occur in the first lens unit L1, especially spherical aberrations, occur on the telephoto side. Therefore, the positive refractive power of the first lens unit L1 is shared by the cemented lens and one positive lens to reduce the occurrence of these aberrations.

  In the second lens unit L2, the absolute value of the refractive power is stronger on the image side than on the object side, and the lens surface on the image side is a concave negative lens, a biconcave negative lens, a biconvex positive lens and a biconcave lens. It consists of four lenses, which are cemented lenses joined with a negative lens. In the zoom lens of each numerical example, the refractive power of the second lens unit L2 is increased within an appropriate range in order to reduce the effective diameter of the first lens unit L1 while obtaining a wide angle of view at the wide angle end. When the refracting power is increased, various aberrations that occur in the second lens unit L2, in particular, curvature of field and lateral chromatic aberration occur frequently on the wide angle side. In each embodiment, the negative refractive power of the second lens unit L2 is shared by two negative lenses to reduce the occurrence of field curvature. In addition, the occurrence of lateral chromatic aberration is reduced in the cemented lens. With such a lens configuration, the effective diameter of the front lens is reduced and high optical performance is obtained while widening the angle.

  The third lens unit L3 includes one negative lens having a concave lens surface on the object side. In the zoom lens of each numerical example, the refractive power of the third lens unit L3 is increased within an appropriate range in order to reduce the front lens diameter. When the refracting power is increased, various aberrations that occur in the third lens unit L3, particularly axial chromatic aberration and coma aberration, occur on the telephoto side. Therefore, a low dispersion material is used for the third lens unit L3, and achromaticity and coma are reduced by forming a concave shape on the object side.

  The fourth lens unit L4 includes four lenses: a biconvex positive lens, an image-side concave negative lens, and a cemented lens in which a negative lens and a biconvex positive lens are cemented. In the zoom lenses according to the numerical examples, the refractive power of the fourth lens unit L4 is increased within an appropriate range in order to shorten the total lens length at the wide angle end. When the refracting power is increased, various aberrations generated in the fourth lens unit L4, particularly spherical aberration on the wide angle side, axial chromatic aberration, and coma aberration, are often generated. Accordingly, the fourth lens unit L4 shares power with two positive lenses and two negative lenses to reduce achromaticity and coma. Further, by adopting an aspherical shape for the positive lens on the most object side, spherical aberration on the wide-angle side is corrected well.

  The fifth lens unit L5 includes a cemented lens in which a negative lens having an image-side concave surface and a positive lens having an object-side convex surface are cemented. In the zoom lens of each numerical example, the refractive power of the fifth lens unit L5 is increased within an appropriate range in order to shorten the total lens length, and the amount of movement for image plane correction is shortened. When the refractive power is increased, various aberrations that occur in the fifth lens unit L5, particularly chromatic aberration and coma aberration due to zooming and focusing, are often generated. Therefore, the fifth lens unit L5 is shared by one positive lens and one negative lens, and in particular, the chromatic aberration is reduced by cementing.

  The sixth lens unit L6 includes one biconvex lens. In each numerical example, the sixth lens unit L6 has a simple single lens structure, so that the retractable thickness is reduced. In addition, the use of a low-dispersion glass material suppresses chromatic aberration fluctuations during zooming.

  The zoom lens of each numerical example is a photographic lens system used in an imaging apparatus, and in the lens cross-sectional view, the left side is the subject side and the right side is the image side. In the lens cross-sectional views of Numerical Examples 1 to 7, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, and L3 is a third lens group having a negative refractive power. , L4 is a fourth lens group having a positive refractive power, L5 is a fifth lens group having a negative refractive power, and L6 is a sixth lens group having a positive refractive power. SP is an aperture stop, which is located between the fourth lens unit L4.

  GB is an optical block corresponding to an optical filter, a face plate, or the like. IP is an image plane. When used as a photographing optical system for a digital still camera or a video camera, the imaging plane of a solid-state imaging device such as a CCD sensor or a CMOS sensor corresponds to a film plane when a camera for a silver salt film is used. To do.

  In the aberration diagrams, d and g are d-line and g-line, respectively, ΔM and ΔS are meridional image plane, sagittal image plane, and lateral chromatic aberration are represented by g-line. Fno is an F number. ω is a half angle of view in the actual trace.

  In the following numerical examples, the wide-angle end and the telephoto end refer to zoom positions when the variable power lens unit is positioned at both ends of a range in which the zoom lens group can move on the optical axis.

  In Numerical Examples 1 to 7, when zooming from the wide-angle end to the telephoto end, as indicated by an arrow, the first lens unit L1 is moved along an image-side convex locus, and the second lens unit L2 is moved from the wide-angle end to the zoom middle. Zooming is performed by moving the image side convex locus, from the middle of the zoom to the telephoto end along the object side convex locus, and moving the fourth lens unit L4 toward the object side. The fifth lens unit L5 is moved along a convex locus toward the image side to correct the image plane variation accompanying the zooming.

  Further, an inner focus method is employed in which the fifth lens unit L5 is moved on the optical axis to perform focusing. A solid curve 5a and a dotted curve 5b relating to the fifth lens unit L5 are movement trajectories for correcting image plane fluctuations accompanying zooming when focusing on an object at infinity and an object at close distance, respectively. Thus, by making the fifth lens unit L5 a convex locus toward the image side, the space between adjacent groups can be effectively used, and the overall lens length can be shortened effectively.

  Further, when focusing from an infinitely distant object to a close object at the telephoto end, the fifth lens unit L5 is moved backward as indicated by an arrow 5c. The first lens unit L1 is fixed in the optical axis direction for focusing, but may be moved as necessary for aberration correction.

  Next, an embodiment of an optical apparatus (digital still camera) using the zoom lens of the present invention as a photographing optical system will be described with reference to FIG.

  In FIG. 29, reference numeral 20 denotes a digital still camera body, and reference numeral 21 denotes a photographing optical system constituted by any of the zoom lenses described in the first to seventh embodiments.

  Reference numeral 22 denotes a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the photographing optical system 21 and is built in the camera body. A memory 23 records information corresponding to a subject image photoelectrically converted by the solid-state imaging device 22. Reference numeral 24 denotes a finder configured by a liquid crystal display panel or the like for observing a subject image photoelectrically converted by the photographed image 22.

  Tables 1 to 7 below show the numerical values of the zoom lenses of Numerical Examples 1 to 7, respectively.

Table 1 Numerical Example 1
Surface data surface number rd nd vd
1 53.505 0.90 2.00069 25.5
2 27.001 4.48 1.49700 81.5
3 -160.474 0.05
4 27.335 2.18 1.81638 46.6
5 162.275 (variable)
6 752.606 0.45 1.88280 37.2
7 * 8.312 3.28
8 -20.618 0.50 1.97675 29.7
9 30.901 0.35
10 19.704 2.41 1.95906 17.5
11 -18.616 0.40 1.81996 44.5
12 59.777 (variable)
13 ∞ 8.50 1.91082 35.3
14 ∞ 1.00
15 -10.625 0.50 1.49700 81.5
16 -17.568 (variable)
17 * 8.947 2.58 1.55332 71.7
18 * -35.663 1.00
19 (Aperture) ∞ 1.32
20 12.416 0.45 1.92321 32.6
21 7.175 1.27
22 9.138 0.45 1.81282 42.3
23 7.207 2.53 1.49700 81.5
24 -78.771 0.38
25 ∞ (variable)
26 37.541 0.50 1.84138 41.9
27 7.073 1.00 1.69895 30.1
28 9.437 (variable)
29 * 9.970 3.76 1.58149 60.7
30 -36.544 1.67
31 ∞ 0.30 1.51633 64.1
32 ∞ 1.60
33 ∞ 0.50 1.51633 64.1
34 ∞ (variable)
Image plane ∞

Aspheric data 7th surface
K = -2.27075e-001 A 4 = 1.57099e-005 A 6 = 2.72224e-007 A 8 = 1.92504e-008

17th page
K = -5.60125e-001 A 4 = -1.66887e-005 A 6 = -3.81731e-007 A 8 = 1.02036e-009

18th page
K = -3.44977e + 001 A 4 = 1.16623e-005

29th page
K = -1.80062e-001 A 4 = -7.25660e-006

Various data Zoom ratio 25.19
Wide angle Medium Telephoto focal length 4.54 44.09 114.40
F number 3.54 6.42 7.00
Angle of view 36.91 5.02 1.94
Total lens length 83.37 95.74 100.58
BF 4.30 4.30 4.30

d 5 0.50 17.41 23.00
d12 6.24 1.69 0.95
d16 19.78 2.77 0.37
d25 4.69 23.43 19.12
d28 7.60 5.87 12.58
d34 0.50 0.50 0.50


Zoom lens group data group Start surface Focal length Lens construction length
1 1 35.59 7.62
2 6 -6.58 7.39
3 13 -55.32 10.00
4 17 13.59 9.60
5 26 -14.02 1.50
6 29 13.85 3.76



Table 2 Numerical example 2
Surface data surface number rd nd vd
1 44.680 0.95 2.00069 25.5
2 25.477 4.50 1.49700 81.5
3 -298.972 0.05
4 27.384 2.20 1.77250 49.6
5 174.489 (variable)
6 3635.196 0.50 1.88202 37.2
7 * 7.612 3.18
8 -25.658 0.45 2.00 100 29.1
9 22.302 0.35
10 16.031 2.49 1.95906 17.5
11 -21.879 0.40 1.88300 40.8
12 111.745 (variable)
13 ∞ 8.50 1.91082 35.3
14 ∞ 1.00
15 -10.877 0.50 1.49700 81.5
16 -17.694 (variable)
17 * 9.313 2.40 1.55332 71.7
18 * -42.646 1.00
19 (Aperture) ∞ 1.32
20 16.233 0.45 1.91082 35.3
21 8.245 1.10
22 10.588 0.45 1.80610 40.9
23 8.061 2.33 1.49700 81.5
24 -28.755 1.29
25 ∞ (variable)
26 38.406 0.50 1.83400 37.2
27 6.282 1.13 1.69895 30.1
28 11.460 (variable)
29 11.001 3.42 1.51742 52.4
30 -38.068 1.98
31 ∞ 0.30 1.51633 64.1
32 ∞ 1.60
33 ∞ 0.50 1.51633 64.1
34 ∞ (variable)
Image plane ∞

Aspheric data 7th surface
K = -2.07663e-001 A 4 = 2.00590e-005 A 6 = 3.27005e-007 A 8 = 3.56208e-008

17th page
K = -1.53632e-001 A 4 = -6.25518e-005 A 6 = -1.98450e-006 A 8 = 1.72958e-008

18th page
K = -7.83013e + 001 A 4 = -9.35722e-006

Various data Zoom ratio 27.08
Wide angle Medium telephoto focal length
F number 3.46 6.39 7.10
Angle of view 36.90 4.70 1.80
Total lens length 85.23 97.88 102.80
BF 4.61 4.61 4.61

d 5 0.50 17.68 23.00
d12 5.74 1.21 0.81
d16 21.83 3.47 0.37
d25 4.68 23.05 19.82
d28 7.42 7.40 13.74
d34 0.50 0.50 0.50


Zoom lens group data group Start surface Focal length Lens construction length
1 1 35.73 7.70
2 6 -6.63 7.37
3 13 -58.12 10.00
4 17 14.28 9.05
5 26 -16.54 1.63
6 29 16.85 3.42



Table 3 Numerical Example 3
Surface data surface number rd nd vd
1 47.338 0.95 2.00069 25.5
2 26.098 4.46 1.49700 81.5
3 -245.743 0.05
4 27.432 2.19 1.79718 46.6
5 169.629 (variable)
6 1880.191 0.45 1.99935 23.8
7 8.558 2.85
8 * -23.993 0.50 1.88167 37.2
9 24.104 0.35
10 16.858 2.72 1.95906 17.5
11 -16.598 0.40 1.85017 47.8
12 70.274 (variable)
13 ∞ 8.50 1.91082 35.3
14 ∞ 1.00
15 -9.731 0.50 1.49711 81.8
16 -17.632 (variable)
17 * 8.847 2.48 1.55332 71.7
18 * -38.377 1.00
19 (Aperture) ∞ 1.32
20 14.782 0.45 1.91456 35.0
21 7.560 1.18
22 8.899 0.45 1.87679 41.0
23 6.811 2.68 1.49700 81.5
24 -31.206 0.40
25 ∞ (variable)
26 47.143 0.50 1.84553 42.3
27 5.777 1.40 1.75443 34.2
28 10.162 (variable)
29 * 11.440 3.38 1.55332 71.7
30 -30.886 1.60
31 ∞ 0.30 1.51633 64.1
32 ∞ 1.60
33 ∞ 0.50 1.51633 64.1
34 ∞ (variable)
Image plane ∞

Aspheric data 8th surface
K = -3.90009e + 000 A 4 = 1.35409e-007 A 6 = -3.89168e-007 A 8 = 4.61453e-009

17th page
K = -4.30988e-001 A 4 = -2.46741e-005 A 6 = -1.24214e-006 A 8 = 1.40098e-008

18th page
K = -5.88052e + 001 A 4 = 4.29298e-006

29th page
K = 1.37359e-001 A 4 = -1.01336e-005

Various data Zoom ratio 28.63
Wide angle Medium Telephoto focal length 4.54 50.33 130.00
F number 3.35 6.53 7.10
Angle of view 36.90 4.40 1.71
Total lens length 83.55 96.93 101.10
BF 4.23 4.23 4.23

d 5 0.53 17.62 23.00
d12 5.82 2.12 0.91
d16 21.20 2.28 0.37
d25 4.98 24.41 17.97
d28 6.61 6.11 14.45
d34 0.50 0.50 0.50


Zoom lens group data group Start surface Focal length Lens construction length
1 1 35.46 7.66
2 6 -7.03 7.28
3 13 -44.54 10.00
4 17 13.58 9.56
5 26 -13.95 1.90
6 29 15.50 3.38



Table 4 Numerical Example 4
Surface data surface number rd nd vd
1 47.823 0.95 2.00069 25.5
2 26.034 4.52 1.49700 81.5
3 -216.156 0.05
4 27.112 2.18 1.80 400 46.6
5 161.803 (variable)
6 762.319 0.45 2.00069 25.5
7 8.224 2.98
8 * -24.096 0.50 1.88202 37.2
9 24.471 0.35
10 16.063 2.58 1.95906 17.5
11 -19.793 0.40 1.80 400 46.6
12 74.576 (variable)
13 ∞ 8.50 1.91082 35.3
14 ∞ 1.00
15 -9.942 0.50 1.49700 81.5
16 -19.721 (variable)
17 * 8.929 2.49 1.55332 71.7
18 * -40.241 1.00
19 (Aperture) ∞ 1.32
20 14.817 0.45 1.91082 35.3
21 7.485 1.19
22 8.890 0.45 1.88 300 40.8
23 6.915 3.25 1.49700 81.5
24 -31.795 0.44
25 ∞ (variable)
26 39.261 0.50 1.80 400 46.6
27 6.543 1.37 1.70154 41.2
28 11.004 (variable)
29 * 12.055 3.41 1.55332 71.7
30 -38.891 1.79
31 ∞ 0.30 1.51633 64.1
32 ∞ 1.60
33 ∞ 0.50 1.51633 64.1
34 ∞ (variable)
Image plane ∞

Aspheric data 8th surface
K = -3.72367e + 000 A 4 = -1.47286e-006 A 6 = -5.42088e-007 A 8 = 7.84905e-009

17th page
K = -3.25461e-001 A 4 = -2.77147e-005 A 6 = -2.11843e-006 A 8 = 2.42537e-008

18th page
K = -8.06061e + 001 A 4 = -1.47480e-005

29th page
K = -7.66354e-003 A 4 = 7.85382e-006

Various data Zoom ratio 28.62
Wide angle Medium Telephoto focal length
F number 3.52 6.57 7.10
Angle of view 36.89 5.09 1.71
Total lens length 82.93 96.82 101.54
BF 4.42 4.42 4.42

d 5 0.50 17.06 23.10
d12 4.88 2.21 0.89
d16 21.05 3.10 0.67
d25 4.65 23.20 14.95
d28 6.60 6.00 16.68
d34 0.50 0.50 0.50


Zoom lens group data group Start surface Focal length Lens construction length
1 1 35.01 7.71
2 6 -7.28 7.26
3 13 -40.96 10.00
4 17 13.94 10.15
5 26 -17.12 1.87
6 29 17.00 3.41



Table 5 Numerical Example 5
Surface data surface number rd nd vd Effective diameter
1 48.084 0.95 2.00069 25.5
2 26.062 4.47 1.49700 81.5
3 -245.866 0.05
4 27.276 2.20 1.80 400 46.6
5 168.039 (variable)
6 615.287 0.45 2.00069 25.5
7 8.446 2.93
8 * -24.405 0.50 1.88202 37.2
9 23.091 0.35
10 16.515 2.60 1.95906 17.5
11 -18.838 0.40 1.80 400 46.6
12 65.929 (variable)
13 ∞ 8.50 1.91082 35.3
14 ∞ 1.00
15 -9.897 0.50 1.49700 81.5
16 -19.045 (variable)
17 * 8.872 2.52 1.55332 71.7
18 * -38.369 1.00
19 (Aperture) ∞ 1.32
20 14.668 0.45 1.91082 35.3
21 7.531 1.18
22 8.916 0.45 1.88 300 40.8
23 6.864 2.81 1.49700 81.5
24 -31.913 0.39
25 ∞ (variable)
26 54.661 0.50 1.80 400 46.6
27 6.114 1.44 1.70154 41.2
28 10.561 (variable)
29 * 11.160 3.47 1.55332 71.7
30 -34.211 1.68
31 ∞ 0.30 1.51633 64.1
32 ∞ 1.60
33 ∞ 0.50 1.51633 64.1
34 ∞ (variable)
Image plane ∞

Aspheric data 8th surface
K = -4.33578e + 000 A 4 = -2.17077e-006 A 6 = -6.19105e-007 A 8 = 7.28648e-009

17th page
K = -3.99056e-001 A 4 = -3.05044e-005 A 6 = -1.48517e-006 A 8 = 1.57545e-008

18th page
K = -6.24812e + 001 A 4 = -5.96760e-006

29th page
K = 1.13820e-001 A 4 = -1.21835e-006

Various data Zoom ratio 28.63
Wide angle Medium Telephoto focal length 4.54 45.56 130.00
F number 3.37 6.50 7.10
Angle of view 36.90 4.86 1.71
Total lens length 83.15 96.99 101.70
BF 4.31 4.31 4.31

d 5 0.50 17.05 23.10
d12 4.96 2.26 0.92
d16 21.44 2.80 0.37
d25 4.78 23.36 17.98
d28 6.73 6.78 14.60
d34 0.50 0.50 0.50


Zoom lens group data group Start surface Focal length Lens construction length
1 1 35.46 7.67
2 6 -7.14 7.23
3 13 -42.15 10.00
4 17 13.63 9.73
5 26 -14.61 1.94
6 29 15.60 3.47



Table 6 Numerical Example 6
Surface data surface number rd nd vd
1 48.152 0.95 2.00069 25.5
2 26.075 4.55 1.49700 81.5
3 -197.087 0.05
4 26.906 2.20 1.80 400 46.6
5 155.239 (variable)
6 -436.011 0.45 2.00069 25.5
7 8.233 2.96
8 * -22.586 0.50 1.88202 37.2
9 22.395 0.35
10 16.198 2.70 1.95906 17.5
11 -17.467 0.40 1.80 400 46.6
12 56.665 (variable)
13 ∞ 8.50 1.91082 35.3
14 ∞ 1.00
15 -8.628 0.50 1.49700 81.5
16 -13.564 (variable)
17 * 8.938 2.55 1.55332 71.7
18 * -38.133 1.00
19 (Aperture) ∞ 1.32
20 16.576 0.45 1.91082 35.3
21 7.971 1.11
22 9.647 0.45 1.88 300 40.8
23 7.332 2.55 1.49700 81.5
24 -27.514 0.05
25 ∞ (variable)
26 50.171 0.50 1.80 400 46.6
27 5.661 1.33 1.70154 41.2
28 11.848 (variable)
29 * 12.987 3.18 1.55332 71.7
30 -27.536 1.58
31 ∞ 0.30 1.51633 64.1
32 ∞ 1.60
33 ∞ 0.50 1.51633 64.1
34 ∞ (variable)
Image plane ∞

Aspheric data 8th surface
K = -5.23682e + 000 A 4 = 1.22621e-005 A 6 = 1.16218e-007 A 8 = 7.70731e-009

17th page
K = -4.64368e-001 A 4 = -3.82286e-005 A 6 = -4.14069e-007 A 8 = 5.87902e-009

18th page
K = -3.90763e + 001 A 4 = 2.35620e-005

29th page
K = -1.17246e + 000 A 4 = 5.43265e-005

Various data Zoom ratio 33.99
Wide angle Medium Telephoto focal length 4.40 47.79 149.43
F number 3.33 6.50 7.10
Angle of view 37.80 4.64 1.49
Total lens length 85.63 99.47 104.17
BF 4.20 4.20 4.20

d 5 0.50 17.34 23.45
d12 5.37 2.36 0.96
d16 22.31 2.45 0.37
d25 5.14 27.23 17.23
d28 8.50 6.28 18.35
d34 0.49 0.49 0.49


Zoom lens group data group Start surface Focal length Lens construction length
1 1 34.84 7.75
2 6 -6.50 7.37
3 13 -49.27 10.00
4 17 13.99 9.43
5 26 -16.34 1.83
6 29 16.37 3.18



Table 7 Numerical Example 7
Surface data surface number rd nd vd
1 60.764 0.90 2.00069 25.5
2 26.521 4.60 1.49700 81.5
3 -147.452 0.05
4 26.801 2.27 1.83481 42.7
5 193.739 (variable)
6 -1116.202 0.45 1.88202 37.2
7 * 8.245 3.40
8 -24.283 0.50 1.88202 37.2
9 30.312 0.35
10 19.677 2.71 1.95906 17.5
11 -16.353 0.40 2.00 100 29.1
12 153.414 (variable)
13 -12.375 0.50 1.49700 81.5
14 -22.679 (variable)
15 * 9.053 2.43 1.55332 71.7
16 * -34.021 1.00
17 (Aperture) ∞ 1.32
18 14.249 0.45 1.95375 32.3
19 8.148 1.13
20 10.780 0.45 1.83481 42.7
21 7.462 2.16 1.49700 81.5
22 -53.267 1.68
23 ∞ (variable)
24 39.333 0.50 1.88202 37.2
25 5.637 1.56 1.69895 30.1
26 11.935 (variable)
27 * 12.984 2.94 1.65844 50.9
28 -52.947 1.60
29 ∞ 0.30 1.51633 64.1
30 ∞ 1.60
31 ∞ 0.50 1.51633 64.1
32 ∞ (variable)
Image plane ∞

Aspheric data 7th surface
K = -9.74253e-001 A 4 = 1.63739e-004 A 6 = 1.56642e-006 A 8 = 2.01012e-008

15th page
K = -5.20508e-001 A 4 = -4.15229e-005 A 6 = -1.02320e-006 A 8 = 5.38370e-009

16th page
K = -3.92119e + 001 A 4 = -2.96973e-005

27th page
K = 1.17164e + 000 A 4 = -4.90737e-005

Various data Zoom ratio 25.18

Focal length 4.54 46.11 114.40
F number 3.34 6.26 7.00
Angle of view 36.90 4.80 1.94
Total lens length 83.39 95.05 100.49
BF 4.22 4.22 4.22

d 5 0.50 17.84 23.00
d12 15.17 9.50 9.77
d14 20.77 3.12 0.37
d23 5.22 22.53 18.55
d26 5.76 6.10 12.83
d32 0.50 0.50 0.50


Zoom lens group data group Start surface Focal length Lens construction length
1 1 35.69 7.82
2 6 -7.07 7.81
3 13 -55.60 0.50
4 15 14.35 8.93
5 24 -14.53 2.06
6 27 16.07 2.94

L1: First group
L2: Second group
L3: Group 3
L4: Group 4
L5: Group 5
L6: Group 6
SP: Aperture
GB: Glass block
IP: Image plane
d: d line
g: g line
Fno: F number
w: Half angle of view
S: Sagittal image plane
M: Meridional image plane

Claims (11)

A. Subsequent including a first lens group having a positive refractive power in order from the object side to the image side, a second lens group having a negative refractive index, a third lens group having a negative refractive power, and a group having a positive refractive power A group of
B. The second lens group has at least one negative lens and one positive lens,
C. The following conditional expressions are satisfied when the moving amounts of the first and second lens units at zooming are M1 and M2, respectively, and the lateral magnification at the wide-angle end and telephoto end of the second lens unit is β2w and β2t. Zoom lens characterized by that. Here, for M1 and M2, the amount of movement toward the object side is −, and the amount of movement toward the image side is +.
−8.0 <M1 / M2 <−2.5
7.0 <β2t / β2w <16.0 A. 2. The zoom lens according to claim 1, wherein in the configuration, when the focal length of the first lens unit is f <b> 1 and the focal length at the wide-angle end is fw, the following conditional expression is satisfied.
6.5 <f1 / fw <10.0 A. 3. The following conditional expression is satisfied, wherein the succeeding lens group includes a fourth lens group, and the amount of movement of the fourth lens group at the time of zooming is M4. The described zoom lens. Here, in M4, the amount of movement toward the object side is-, and the amount of movement toward the image side is +.
-6.0 <M4 / fw <-3.5 A. 4. The fourth lens group according to claim 1, wherein the fourth lens group has a positive refractive power, and satisfies the following conditional expressions when the lateral magnifications at the wide-angle end and the telephoto end are β4t and β4w, respectively: The zoom lens according to any one of the items.
1.0 <β4t / β4w <5.0 A. 5. The zoom lens according to claim 1, wherein the following conditional expression is satisfied, where fre is a combined focal length at the wide-angle end of the subsequent lens group.
3.1 <fre / fw <7.0 A. The fourth lens group includes a plurality of positive lenses, and satisfies the following conditional expression when an average Abbe number of positive lenses in the fourth lens group is ν4p. 6. The zoom lens according to any one of items 5.
ν4p> 70 A. 7. The zoom lens according to claim 1, wherein when the average refractive index of the second lens group is N2ave, the following conditional expression is satisfied.
N2ave> 1.85 A. The zoom according to any one of claims 1 to 7, wherein the whole or a part of the fourth lens group is moved vertically in the optical axis direction to correct the image plane movement of the subject image. lens. A. 9. The zoom lens according to claim 1, wherein the third lens group includes a member for bending an optical path. A. 10. An optical apparatus comprising: the zoom lens according to claim 1; and an effective image circle diameter at a wide angle side smaller than an effective image circle diameter at a telephoto end. A. 11. An optical apparatus comprising: the zoom lens according to claim 1; and an image sensor that receives an image formed by the zoom lens.