JP2015049428A - Zoom lens and image capturing device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens with anti-shake capability, which has a large aperture and yet exhibits just small aberration variations and acquires good images even when anti-shake is enabled.SOLUTION: A zoom lens comprises, in order from the object side to the image side, first and second lens groups having positive and negative refractive power, respectively, an intermediate group, and a final lens group. A focal length ft of the entire system at the telephoto end, a lateral magnification βvct of an anti-shake group VC at the telephoto end, a lateral magnification βrt of all the lens groups located on the image side of the anti-shake group VC at the telephoto end, a focal length fvc of the anti-shake group VC, a curvature radius Rf of a most object side lens surface of the anti-shake group VC, a curvature radius Rr of a most image side lens surface of the anti-shake group VC, a focal length f1 of the first lens group, and a focal length f3 of a third lens group located on the most object side in the intermediate group are each set appropriately.

Description

  The present invention relates to a zoom lens and an imaging apparatus having the same, and is suitably used for electronic cameras such as video cameras and digital still cameras, film cameras, broadcast cameras, and the like.

  2. Description of the Related Art In recent years, image pickup elements used in image pickup apparatuses such as digital still cameras and video cameras have been increased in size and increased in pixels (higher density). A zoom lens used in an image pickup apparatus including such an image pickup element is required to have various optical aberrations corrected and high optical performance.

  In particular, it is required to have a large aperture ratio that enables photographing in a dark place and obtains an image with a shallow depth (emphasized blur), and that the entire system is small. In addition, in order to obtain a higher-definition image, it is required to have a function of suppressing image degradation due to the influence of vibration such as camera shake during photographing, a vibration-proof function, and the like.

  As an anti-vibration mechanism, there is known a zoom lens that compensates for image blur due to vibration by moving all or part of a lens group constituting the zoom lens in a direction substantially perpendicular to the optical axis. Of these, in order from the object side to the image side, in a five-group zoom lens composed of lens groups having positive, negative, positive, negative, and positive refractive power, all or part of the fourth lens group is used for image stabilization. Zoom lenses that move in a direction perpendicular to the optical axis are known (Patent Documents 1 and 2).

JP 2006-47348 A JP 2007-264174 A

  If the anti-vibration group is decentered in the zoom lens, decentration aberrations such as decentration coma and decentration field curvature occur, and the image becomes blurred. In particular, in a zoom lens with a large aperture ratio, decentration coma and decentration field curvature are likely to increase, and image quality is likely to deteriorate during image stabilization. Therefore, in a large-aperture-ratio zoom lens having an anti-vibration function, the amount of decentration aberration when the anti-vibration group is decentered can be reduced by appropriately setting the lens configuration of the anti-vibration group. is important.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a zoom lens that has a vibration proofing mechanism and has a large diameter and can obtain a good image during vibration proofing, and an image pickup apparatus having the same.

The zoom lens according to the present invention includes, 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, an intermediate group having one or more lens groups, and a positive refractive power. The zoom lens is composed of a final lens group, and the interval between adjacent lens groups changes during zooming, and the intermediate group is a negative lens that moves in a direction having a component perpendicular to the optical axis during image blur correction. The anti-vibration group includes a negative lens and a positive lens or a single negative lens. The focal length of the entire system at the telephoto end is ft, and the horizontal side of the anti-vibration group at the telephoto end. The magnification is βvct, the lateral magnification at the telephoto end of the optical system located on the image side of the image stabilization group is βrt, the focal length of the image stabilization group is fvc, and the radius of curvature of the lens surface closest to the object side of the image stabilization group is Rf, half the curvature of the lens surface closest to the image side of the image stabilizing group When the diameter is Rr, the focal length of the first lens unit is f1, and the focal length of the third lens unit located closest to the object side of the intermediate unit is f3,
0.8 <ft / (| (1-βvct) × βrt × fvc |) <2.9
0.3 <(Rf−Rr) / (Rf + Rr) <1.0
3.0 <f1 / f3 <5.5
It satisfies the following conditional expression.

  According to the present invention, it is possible to obtain a zoom lens having an anti-vibration function capable of obtaining a good image even at the time of anti-vibration while having a large aperture and little aberration fluctuation at the time of anti-vibration.

Cross-sectional view of a lens according to Example 1 of the present invention (A), (B) Aberration diagrams at the wide-angle end and the telephoto end of Example 1 of the present invention. Lens sectional drawing of Example 2 of the present invention (A), (B) Aberration diagrams at the wide-angle end and the telephoto end of Example 2 of the present invention. Lens sectional view of Example 3 of the present invention (A), (B) Aberration diagrams at the wide-angle end and the telephoto end of Example 3 of the present invention. Lens sectional view of Example 4 of the present invention (A), (B) Aberration diagrams at the wide-angle end and the telephoto end of Example 4 of the present invention. Lens sectional drawing of Example 5 of the present invention (A), (B) Aberration diagrams at the wide-angle end and the telephoto end according to Example 5 of the present invention. Lens sectional drawing of Example 6 of the present invention (A), (B) Aberration diagrams at the wide-angle end and the telephoto end of Example 6 of the present invention. Relationship diagram between the radius of curvature of the object-side lens surface and the coma coefficient in the image stabilization group Schematic diagram of main parts of an imaging apparatus of the present invention

  Embodiments of the zoom lens of the present invention and an image pickup apparatus having the same will be described below. The zoom lens according to the present invention includes, 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, an intermediate group having one or more lens groups, and a positive refractive power. It consists of the final lens group. The distance between adjacent lens units changes during zooming. The intermediate group includes an anti-vibration group VC having a negative refractive power that moves in a direction having a component perpendicular to the optical axis during image blur correction. Here, the refractive power is optical power and is the reciprocal of the focal length.

  FIG. 1 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end (short focal length end) of the zoom lens according to Embodiment 1 of the present invention. FIGS. 2A and 2B are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end and the telephoto end (long focal length end) of the zoom lens of Example 1. FIGS. FIG. 3 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 2 of the present invention. 4A and 4B are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end and the telephoto end of the zoom lens of Example 2. FIGS.

  FIG. 5 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 3 of the present invention. FIGS. 6A and 6B are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end and the telephoto end of the zoom lens of Example 3. FIGS. FIG. 7 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 4 of the present invention. FIGS. 8A and 8B are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end and the telephoto end of the zoom lens of Example 4. FIGS.

  FIG. 9 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 5 of the present invention. FIGS. 10A and 10B are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end and the telephoto end of the zoom lens of Example 5. FIGS. FIG. 11 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 6 of the present invention. 12A and 12B are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end and the telephoto end of the zoom lens according to the sixth embodiment.

  FIG. 13 is an explanatory diagram showing the relationship between the radius of curvature of the lens surface on the object side of the image stabilizing group and the coma aberration coefficient. FIG. 14 is a schematic diagram of a main part of a camera (image pickup apparatus) including the zoom lens of the present invention. The zoom lens according to each embodiment is a photographing lens system used in an imaging apparatus such as a video camera, a digital camera, and a silver salt film camera.

  In the lens cross-sectional view, the left side is the object side (front), and the right side is the image side (rear). In the lens cross-sectional view, i indicates the order of the lens groups from the object side, and Li is the i-th lens group. LM is an intermediate group having one or more lens groups. LR is a final lens unit having a positive refractive power located closest to the object side. The intermediate group LM has an anti-vibration group VC having a negative refractive power that moves in a direction having a component perpendicular to the optical axis during image blur correction.

  In Examples 1, 2, 3, 5, and 6 of FIGS. 1, 3, 5, 9, and 11, in order from the object side to the image side, the first lens unit L1 having a positive refractive power, negative refraction is used. The second lens unit L2 has a strong power, the third lens unit L3 has a positive refractive power, and the fourth lens unit L4 has a negative refractive power. Further, the fifth lens unit L5 has a positive refractive power, and each lens unit moves along a different locus during zooming. In Examples 1, 3, 5, and 6, the image stabilizing group VC is the fourth lens group L4. In Example 2, the fourth lens unit L4 includes a fourth-a lens unit L4a having a negative refractive power and a fourth-b lens unit L4b having a positive refractive power, and the fourth-a lens unit L4a is the anti-vibration group VC.

  In Example 4 of FIG. 7, in order from the object side to the image side, the first lens unit L1 having a positive refractive power, the second lens unit L2 having a negative refractive power, the third lens unit L3 having a positive refractive power, and a negative lens unit. The fourth lens unit L4 has a negative refractive power, the fifth lens unit L5 has a negative refractive power, and the sixth lens unit L6 has a positive refractive power. During zooming, the lens units move along different trajectories, and the anti-vibration unit VC is the fourth lens unit L4.

  In each lens cross-sectional view, L3f is a focusing lens part, and is composed of all or part of the third lens unit L3. SP is an aperture stop, which is arranged on the image side of the third lens unit L3. IP is an image plane. When used as a photographing optical system for a video camera or a digital still camera, an imaging surface of a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor is arranged, and a camera for a silver salt film In this case, the film surface is arranged.

  In the aberration diagrams, M is a meridional image plane, and S is a sagittal image plane. ω is a half angle of view, and Fno is an F number. In the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the lens groups are positioned at both ends of a range in which the lens group can move on the optical axis. The arrows indicate the movement trajectory of each lens unit during zooming from the wide-angle end to the telephoto end.

  In each embodiment, the image stabilization group VC includes a negative lens and a positive lens or one negative lens having an aspherical surface.

  Let ft be the focal length of the entire system at the telephoto end. Let fvc be the focal length of the image stabilization group VC. Let βvct be the lateral magnification of the image stabilizing group VC at the telephoto end. Let βrt be the lateral magnification of all lens units located on the image side of the image stabilizing group VC at the telephoto end. Let Rf be the radius of curvature of the lens surface closest to the object side of the image stabilization group VC. Let Rr be the radius of curvature of the lens surface closest to the image side of the image stabilizing group VC. Let the focal length of the first lens unit L1 be f1. The focal length of the third lens unit L3 located closest to the object side of the intermediate unit LM is defined as f3.

At this time,
0.8 <ft / (| (1-βvct) × βrt × fvc |) <2.9 (1)
0.3 <(Rf−Rr) / (Rf + Rr) <1.0 (2)
3.0 <f1 / f3 <5.5 (3)
The following conditional expression is satisfied. Next, the technical meaning of the conditional expressions (1), (2), and (3) will be described.

  According to the aberration coefficient equation for image stabilization, regarding the influence of the bending aberration during image stabilization, if the zoom type is determined, the lens system placed on the object side of the image stabilization group and the coma for the image stabilization group are mainly used. It is known to be affected by aberration coefficients and curvature aberration coefficients. The aberration coefficient related to image stabilization is described in, for example, Japanese Patent Application Laid-Open No. 2009-282202, and detailed description thereof is omitted.

  It is known that when attention is paid to fluctuations in curvature aberration during image stabilization, the situation of coma aberration generated by the image stabilization group is also affected. For this reason, the influence on the coma aberration of the image stabilizing group, in particular, the lens shape also has an important influence.

  In FIG. 13, the object point position is set so as to match the image stabilization group of this embodiment (in this example, 10 mm on the image side with respect to the lens of the image stabilization group), and the horizontal axis of the lens surface on the object side is set. This is plotted with the curvature and the coma coefficient on the vertical axis. In this case, the refractive power is normalized to 1.

  In the bending characteristic diagram with constant refractive power as described above, the coma aberration coefficient is roughly represented by a linear function of curvature (1 / r), and it is known that the coma aberration coefficient is always 0 at some point. Yes. For example, when the curvature of the object-side lens surface of the image stabilization group is negative, that is, the object-side lens surface is concave, the coma aberration coefficient increases. Even if the convex shape of the lens surface on the object side becomes too large, the lens surface depth is too large, and the thickness when the camera is retracted becomes large.

  In the present invention, considering the bending characteristic diagram of FIG. 13, the lens shape of the image stabilizing group is set to the range of the conditional expression (2) so that the coma aberration hardly occurs. As a result, as described above, the effect of suppressing the fluctuation of the bending characteristic at the time of vibration isolation is obtained. That is, the coma aberration coefficient generated from the second lens group L2 and the third lens group L3 is suppressed by the coma coefficient of the first lens group L1, and the aberrations of the first lens group L1 and the third lens group L3. By appropriately setting the coefficient ratio, it is possible to obtain the effect of suppressing the fluctuation of the bending characteristic.

  In the zoom lens of each embodiment, the intermediate group LM includes the anti-vibration group VC having a negative refractive power, thereby realizing a compact zoom lens while maintaining telecentric performance. In addition, the anti-vibration group VC having the negative refractive power included in the intermediate group LM is used for anti-vibration. In order to suppress aberration fluctuations such as bending aberration, conditional expressions (1) to (3) are defined. doing.

  Conditional expression (1) prescribes the ratio of the amount driven at the time of image stabilization to the focal length of the image stabilization group VC. If the absolute value of the negative refractive power of the image stabilization group VC increases beyond the upper limit of the conditional expression (1), the fluctuation of the bending aberration during image stabilization increases. On the other hand, if the lower limit is exceeded, the amount of image stabilization at the time of image stabilization of the image stabilization group VC is too large, and the aberration fluctuation increases. More preferably, the conditional expression (1) is the following conditional expression (1a), so that a zoom lens that is more compact and has less curvature fluctuation at the time of image stabilization can be realized.

0.9 <ft / (| (1-βvct) × βrt × fvc |) <2.8 (1a)
Conditional expression (2) defines the shape of the lens constituting the image stabilizing group VC. If the lower limit of conditional expression (2) is exceeded, the curvature of the lens surface on the object side that constitutes the image stabilization group VC becomes too large, the lens thickness increases, and it becomes difficult to store the zoom lens small when retracted. Become. On the other hand, if the upper limit is exceeded, the object-side lens surface of the image stabilization group VC becomes concave, so that many coma aberrations occur, and the fluctuation of the curvature during image stabilization increases. More desirably, by making conditional expression (2) the following conditional expression (2a), it is possible to realize a zoom lens that is more compact and has less curvature fluctuation during image stabilization.

0.32 <(Rf−Rr) / (Rf + Rr) <0.95 (2a)
Conditional expression (3) defines the ratio of the focal length of the first lens unit L1 to the focal length of the third lens unit L3. Conditional expression (3) mainly serves to cancel coma aberration generated in the third lens unit L3 by the first lens unit L1. If the lower limit of conditional expression (3) is exceeded and the refractive power of the first lens unit L1 is too strong, the effective diameter of the front lens becomes large. On the other hand, if the upper limit is exceeded and the refractive power of the third lens unit L3 becomes too strong, it becomes difficult to suppress the fluctuation of the bending aberration during the image stabilization.

  More desirably, by making conditional expression (3) the following conditional expression (3a), it is possible to realize a zoom lens that is more compact and has less curvature fluctuation during image stabilization.

3.1 <f1 / f3 <5.3 (3a)
In each embodiment, it is more preferable to satisfy one or more of the following conditional expressions. The focal length of the second lens unit L2 is f2. The focal length of the final lens group LR is fp. At this time, it is preferable to satisfy one or more of the following conditional expressions.

4.0 <f1 / | f2 | <9.5 (4)
0.4 <f1 / | fvc | <2.0 (5)
0.45 <fp / ft <1.20 (6)
Next, the technical meaning of each conditional expression described above will be described.

  Conditional expression (4) defines the ratio of the focal length of the first lens unit L1 to the focal length of the second lens unit L2. If the lower limit of conditional expression (4) is exceeded and the refractive power of the first lens unit L1 is too strong, the effective diameter of the front lens becomes large. On the contrary, if the upper limit is exceeded, the refractive power of the second lens unit L2 becomes too strong, and it becomes difficult to suppress the fluctuation of the bending aberration during the image stabilization. More desirably, by making conditional expression (4) into the following conditional expression (4a), it is possible to realize a zoom lens that is more compact and has less curvature fluctuation during image stabilization.

4.5 <f1 / | f2 | <9.3 (4a)
Conditional expression (5) defines the ratio of the focal length of the first lens unit L1 to the focal length of the image stabilizing group VC. If the lower limit of conditional expression (5) is exceeded and the refractive power of the first lens unit L1 is too strong, the effective diameter of the front lens becomes large.

  On the contrary, if the upper limit is exceeded, if the absolute value of the negative refractive power of the image stabilization group VC increases, it becomes difficult to suppress the fluctuation of the bending aberration during image stabilization. More desirably, by making conditional expression (5) the following conditional expression (5a), it is possible to realize a zoom lens that is more compact and has less curvature fluctuation during vibration isolation.

0.5 <f1 / fvc <1.9 (5a)
Conditional expression (6) defines the ratio of the focal length of the final lens unit LR to the focal length of the entire system at the telephoto end. If the lower limit of conditional expression (6) is exceeded, the refractive power of the final lens group LR becomes too strong, and the lens system increases.

  On the contrary, if the upper limit is exceeded, the refractive power of the final lens unit LR becomes too weak and it becomes difficult to maintain the telecentricity on the image side. More desirably, by making conditional expression (6) the following conditional expression (6a), a zoom lens with more maintained telecentricity can be realized.

0.50 <f1 / fvc <1.10 (6a)
In each embodiment, the third lens unit L3 preferably includes two or more positive lenses and one or more negative lenses. According to this, it becomes easy to suppress the coma generated by the third lens unit L3. In addition, it becomes easier to reduce the curvature aberration generated by the lens unit on the object side than the image stabilization group VC for image stabilization. Next, features of each embodiment will be described.

[Example 1]
A zoom lens according to a first embodiment of the present invention will be described with reference to FIG. The zoom lens according to the first exemplary embodiment includes, in order from the object side to the image side, a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, and a negative lens unit. The fourth lens unit L4 has a refractive power of 5 and the fifth lens unit L5 has a positive refractive power. In Example 1, the fourth lens unit L4 is the image stabilizing group VC, and the fourth lens unit L4 is moved so as to have a component perpendicular to the optical axis during image blur correction. As a result, image blur when the zoom lens vibrates is corrected. That is, vibration isolation is performed.

  During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves to the object side. The first lens unit L1 may be moved while drawing a locus showing a convex shape on the image side for the purpose of ensuring a sufficient peripheral illumination ratio in the intermediate zoom range. The second lens unit L2 moves to the image side. The main zooming is performed by moving the third lens unit L3 to the object side. The fourth lens unit L4 and the fifth lens unit L5 move along a locus showing a convex shape on the object side.

  The fourth lens unit L4 for image stabilization includes a cemented lens in which a negative lens and a positive lens are cemented in order from the object side to the image side. The shape of the cemented lens is set so that the object-side surface is convex and has a meniscus shape to reduce aberration fluctuations during image stabilization. As a result, even when the F-number at the wide-angle end becomes a large aperture ratio of about 2, fluctuations such as bending aberration during vibration isolation are reduced.

[Example 2]
A zoom lens according to a second embodiment of the present invention will be described with reference to FIG. The zoom lens according to the second exemplary embodiment is configured as follows in order from the object side to the image side. The first lens unit L1 having a positive refractive power, the second lens unit L2 having a negative refractive power, the third lens unit L3 having a positive refractive power, the fourth lens unit L4 having a negative refractive power, and the first lens unit L4 having a positive refractive power. It consists of five lens units L5. The fourth lens unit L4 includes a fourth-a lens portion L4a having a negative refractive power and a fourth-b lens portion L4b having a positive refractive power.

  In the second embodiment, the fourth-a lens unit L4a is the anti-vibration group VC, which performs anti-vibration. During zooming from the wide-angle end to the telephoto end, each lens unit moves to the object side along a different path. Thus, even if the F-number at the wide-angle end has a large aperture ratio, fluctuations such as bending aberration during vibration isolation are reduced. Other points are the same as those in the first embodiment.

[Example 3]
With reference to FIG. 5, a zoom lens according to Example 3 of the present invention will be described. The zoom type, such as the number of lens groups of the zoom lens of Example 3, the refractive power of each lens group, and the movement conditions of each lens group during zooming, is the same as that of Example 1. The anti-vibration group VC and its lens configuration are the same as those in the first embodiment.

[Example 4]
A zoom lens according to a fourth embodiment of the present invention will be described with reference to FIG. The zoom lens according to the fourth exemplary embodiment is configured as follows in order from the object side to the image side. The first lens unit L1 having a positive refractive power, the second lens unit L2 having a negative refractive power, the third lens unit L3 having a positive refractive power, the fourth lens unit L4 having a negative refractive power, and the first lens unit L4 having a negative refractive power. The lens unit includes a five lens unit L5 and a sixth lens unit L6 having a positive refractive power.

  In the fourth embodiment, the fourth lens unit L4 is the anti-vibration group VC, which performs anti-vibration. During zooming from the wide-angle end to the telephoto end, each lens unit moves to the object side along a different path. Thus, even if the F-number at the wide-angle end has a large aperture ratio, fluctuations such as bending aberration during vibration isolation are reduced. The other points are the same as those in the second embodiment.

[Example 5]
With reference to FIG. 9, a zoom lens according to Example 5 of the present invention will be described. In the zoom lens of Example 5, the number of lens groups and the refractive power of each lens group are the same as those of Example 1. In the fifth embodiment, the fourth lens unit L4 is the anti-vibration group VC, which performs anti-vibration. During zooming from the wide-angle end to the telephoto end, each lens unit moves to the object side along a different path. As a result, even when the F-number at the wide-angle end is about 2 and the aperture ratio is large, fluctuations such as bending aberration at the time of image stabilization are reduced. Other points are the same as those in the first embodiment.

[Example 6]
Hereinafter, a zoom lens according to Example 6 of the present invention will be described with reference to FIG. The zoom type of the zoom lens of Example 6 is the same as that of Example 5. In the sixth embodiment, the fourth lens unit L4 is the image stabilizing group VC, which performs image stabilization. Other points are the same as those in the first embodiment.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary. For example, the aperture diameter of the aperture stop may be controlled in order to reduce the fluctuation of the F number during zooming. Further, when combined with an image pickup apparatus including an image pickup element that converts an optical image formed on the light receiving surface into an electric signal, electrical correction may be added depending on the amount of distortion.

  As described above, according to each embodiment, although having a large diameter, a mechanism for vibration compensation (anti-vibration) is provided, the entire apparatus can be easily downsized, and a good image can be obtained at the time of vibration compensation. Therefore, it is possible to obtain a zoom lens having an anti-vibration function.

  Next, an embodiment using the zoom lens of the present invention will be described with reference to FIG. In FIG. 14, 10 is a single-lens reflex camera body, and 11 is an interchangeable lens equipped with a zoom lens according to the present invention. Reference numeral 12 denotes a photosensitive surface such as a silver salt film for recording a subject image obtained through the interchangeable lens 11 or a solid-state imaging device (photoelectric conversion device) for receiving the subject image. Reference numeral 13 denotes a finder optical system for observing a subject image from the interchangeable lens 11, and reference numeral 14 denotes a rotating quick return mirror for switching and transmitting the subject image from the interchangeable lens 11 to the photosensitive surface 12 and the finder optical system 13.

  When observing the subject image with the finder, the subject image formed on the focusing plate 15 via the quick return mirror 14 is converted into an erect image with the pentaprism 16 and then magnified with the eyepiece optical system 17 for observation.

  At the time of shooting, the quick return mirror 14 rotates in the direction of the arrow, and the subject image is formed and recorded on the photosensitive surface recording means 12. Thus, by applying the zoom lens of the present invention to an optical device such as a single lens reflex camera interchangeable lens, an optical device having high optical performance can be realized. The present invention can be similarly applied to an SLR (Single Lens Reflex) camera having no quick return mirror. Further, the zoom lens of the present invention can be similarly applied to a video camera.

  In the following, numerical examples 1 to 6 corresponding to the first to sixth examples will be described. In each numerical example, i indicates the order of the surfaces from the object side, ri is the i-th (i-th surface) radius of curvature, di is the distance between the i-th surface and the (i + 1) -th surface, ndi, νdi Represents the refractive index and the Abbe number based on the d-line of the i-th lens material. BF is a back focus. The aspheric data shows the aspheric coefficient when the aspheric surface is expressed by the following equation.

However,
x: Displacement from the reference plane in the optical axis direction
h: Height in the direction perpendicular to the optical axis
R: Radius of base quadric surface
k: Conical constant
An: nth-order aspheric coefficient “EZ” means “10 ^−Z ”. Table 1 shows the relationship between the above-described conditional expressions and numerical values in the numerical examples.

(Numerical example 1)
Unit mm

Surface data surface number rd nd νd Effective diameter
1 83.630 2.00 1.94595 18.0 50.55
2 56.329 4.84 1.69680 55.5 46.69
3 118.394 0.15 44.31
4 37.508 5.23 1.69680 55.5 38.87
5 135.720 (variable) 37.90
6 111.098 1.20 1.88300 40.8 29.97
7 13.991 7.31 21.74
8 -34.445 0.90 1.80400 46.6 21.43
9 29.297 0.12 21.12
10 25.901 3.36 2.00178 19.3 21.37
11 * 924.715 (variable) 21.16
12 * 13.866 6.19 1.76802 49.2 21.32
13 116.210 0.12 19.99
14 * 16.899 0.52 1.84666 23.8 17.93
15 10.637 5.09 16.06
16 20.341 3.92 1.59282 68.6 15.73
17 -32.483 0.15 15.18
18 -30.949 0.70 1.92286 20.9 15.06
19 -86.436 1.34 14.78
20 (Aperture) ∞ (Variable) 13.76
21 795.325 0.70 1.69680 55.5 16.68
22 17.430 2.29 1.68893 31.1 16.94
23 26.588 (variable) 17.12
24 * 19.148 4.35 1.48749 70.2 21.03
25 187.841 (variable) 21.16
Image plane ∞

Aspheric data 11th surface
K = 5.69819e + 003 A 4 = 1.68666e-006 A 6 = -9.06463e-009 A 8 = 2.71886e-010 A10 = -1.17899e-012

12th page
K = -5.08067e-001 A 4 = 1.27424e-005 A 6 = 5.68407e-009 A 8 = 3.97908e-010

14th page
K = -5.12841e-001 A 4 = -1.45830e-005 A 6 = -2.79382e-008 A 8 = -2.06681e-009 A10 = 6.24676e-012

24th page
K = 0.00000e + 000 A 4 = -4.03606e-005 A 6 = 8.14320e-008 A 8 = -7.37539e-010 A10 = 2.06121e-012

Various data Zoom ratio 4.71
Wide angle Medium telephoto focal length 16.09 41.83 75.78
F number 2.07 5.15 6.00
Half angle of view (degrees) 36.26 18.01 10.17
Image height 11.80 13.60 13.60
Total lens length 100.68 110.04 120.89
BF 15.19 27.94 26.84

d 5 0.58 12.48 22.70
d11 24.56 7.30 1.39
d20 2.63 7.73 17.32
d23 7.27 4.13 2.17
d25 15.19 27.94 26.84

Entrance pupil position 29.21 58.29 103.55
Exit pupil position -17.75 -18.76 -25.40
Front principal point position 37.44 62.65 69.40
Rear principal point position -0.90 -13.89 -48.94

Zoom lens group data group Start surface Focal length Lens construction length Front principal point position Rear principal point position L1 1 68.67 12.22 0.82 -6.24
L2 6 -13.81 12.88 1.91 -7.91
L3 12 21.56 18.03 2.70 -12.31
L4 21 -39.27 2.99 1.81 0.04
L5 24 43.37 4.35 -0.33 -3.23

Single lens Data lens Start surface Focal length
1 1 -189.14
2 2 149.42
3 4 72.80
4 6 -18.23
5 8 -19.57
6 10 26.55
7 12 19.98
8 14 -35.25
9 16 21.70
10 18 -52.56
11 21 -25.58
12 22 66.66
13 24 43.37

(Numerical example 2)
Unit mm

Surface data surface number rd nd νd Effective diameter
1 75.067 2.00 1.94595 18.0 51.67
2 50.901 5.81 1.69680 55.5 48.32
3 157.034 0.15 46.93
4 41.593 6.39 1.69680 55.5 41.71
5 150.530 (variable) 40.01
6 68.409 1.16 1.88300 40.8 26.52
7 14.107 8.13 20.67
8 -36.019 1.16 1.88300 40.8 18.82
9 33.101 0.14 18.39
10 26.656 4.07 1.94595 18.0 18.54
11 -80.146 2.90 18.15
12 * -20.825 0.93 1.85400 40.4 17.13
13 -59.158 (variable) 17.37
14 * 21.066 3.89 1.69680 55.5 22.84
15 98.662 0.12 22.71
16 19.395 7.16 1.59282 68.6 22.75
17 -49.494 0.12 21.60
18 73.194 0.70 1.84666 23.8 19.08
19 * 16.605 0.81 16.88
20 17.270 3.92 1.48749 70.2 16.86
21 -575.834 1.16 16.19
22 (Aperture) ∞ (Variable) 15.42
23 109.767 0.70 1.69680 55.5 14.53
24 * 22.129 2.32 13.87
25 23.412 2.16 1.84666 23.8 13.30
26 28.821 (variable) 12.53
27 * 19.718 4.51 1.48749 70.2 17.21
28 33.352 (variable) 17.66
Image plane ∞

Aspheric data 12th surface
K = 8.45178e-001 A 4 = 7.80197e-006 A 6 = 6.98896e-008 A 8 = -7.50139e-010 A10 = 6.49626e-012

14th page
K = -1.01557e-001 A 4 = -3.07775e-006 A 6 = -6.51269e-008 A 8 = -2.21811e-010

19th page
K = 6.64216e-001 A 4 = 5.12752e-005 A 6 = 2.31786e-007 A 8 = -9.64526e-010 A10 = 1.35649e-011

24th page
K = 0.00000e + 000 A 4 = -3.44118e-006 A 6 = 3.91332e-008 A 8 = -2.45333e-010

27th page
K = 0.00000e + 000 A 4 = -2.39365e-005 A 6 = -1.71751e-008 A 8 = 3.98619e-010 A10 = -2.30944e-012

Various data Zoom ratio 3.97
Wide angle Medium telephoto focal length 20.92 37.14 82.98
F number 2.10 5.00 6.00
Half angle of view (degrees) 29.64 20.11 9.31
Image height 11.90 13.60 13.60
Total lens length 103.53 111.86 129.55
BF 13.91 22.98 34.39

d 5 3.61 10.90 22.22
d13 13.43 6.82 1.37
d22 1.16 5.58 9.30
d26 11.01 5.17 1.87
d28 13.91 22.98 34.39

Entrance pupil position 38.77 60.33 121.31
Exit pupil position -20.39 -17.69 -17.06
Front principal point position 46.93 63.56 70.46
Rear principal point position -7.01 -14.16 -48.59

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
L 1 1 64.57 14.35 0.95 -7.35
L 2 6 -10.33 18.49 4.32 -8.44
L 3 14 18.04 17.88 1.62 -10.80
L 4 23 -57.33 5.18 1.46 -2.31
L 5 27 89.27 4.51 -3.96 -6.69

Single lens Data lens Start surface Focal length
1 1 -174.15
2 2 105.71
3 4 80.54
4 6 -20.33
5 8 -19.38
6 10 21.55
7 12 -38.06
8 14 37.66
9 16 24.45
10 18 -25.51
11 20 34.47
12 23 -39.91
13 25 124.58
14 27 89.27

(Numerical Example 3)
Unit mm

Surface data surface number rd nd νd Effective diameter
1 65.228 2.00 1.94595 18.0 50.48
2 47.456 5.17 1.69680 55.5 46.53
3 88.160 0.15 44.02
4 41.871 4.94 1.69680 55.5 39.52
5 142.283 (variable) 38.61
6 142.378 1.20 1.88300 40.8 26.67
7 13.179 6.05 20.00
8 -47.464 0.90 1.88300 40.8 19.75
9 35.446 0.87 19.41
10 28.835 2.90 1.94595 18.0 19.89
11 1740.640 (variable) 19.80
12 * 15.453 5.04 1.77250 49.6 21.56
13 72.432 2.84 20.67
14 123.084 2.65 1.59282 68.6 18.43
15 -45.869 0.12 17.62
16 -69.440 0.70 1.84666 23.8 17.01
17 * 25.116 0.07 15.57
18 17.263 3.62 1.59282 68.6 15.59
19 -87.337 1.16 15.15
20 (Aperture) ∞ (Variable) 14.23
21 349.729 0.70 1.69350 53.2 15.09
22 17.400 2.27 1.71736 29.5 15.39
23 25.276 (variable) 15.62
24 * 19.082 4.93 1.48749 70.2 21.23
25 78.743 (variable) 21.32
Image plane ∞

Aspheric data 12th surface
K = -6.46132e-001 A 4 = 2.37777e-005 A 6 = 6.99525e-008 A 8 = 1.74530e-010

17th page
K = 1.62306e + 000 A 4 = 7.24456e-005 A 6 = 5.40826e-007 A 8 = -1.74497e-009 A10 = 5.28140e-011

24th page
K = 0.00000e + 000 A 4 = -3.46423e-005 A 6 = 3.25939e-008 A 8 = -1.62350e-010 A10 = 5.24958e-013

Various data Zoom ratio 4.71
Wide angle Medium Telephoto focal length 16.61 41.76 78.21
F number 2.07 4.64 6.00
Half angle of view (degrees) 35.39 18.04 9.86
Image height 11.80 13.60 13.60
Total lens length 97.81 108.49 120.70
BF 14.83 27.15 26.20

d 5 2.15 14.73 26.99
d11 22.55 7.13 1.16
d20 2.62 7.07 16.13
d23 7.41 4.14 1.96
d25 14.83 27.15 26.20

Entrance pupil position 29.86 59.24 111.51
Exit pupil position -17.17 -17.16 -22.14
Front principal point position 37.84 61.64 63.17
Rear principal point position -1.78 -14.61 -52.02

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
L 1 1 75.45 12.25 -0.12 -7.17
L 2 6 -13.84 11.91 1.10 -8.51
L 3 12 20.41 16.19 1.62 -10.55
L 4 21 -40.19 2.97 1.96 0.21
L 5 24 50.30 4.93 -1.03 -4.26

Single lens Data lens Start surface Focal length
1 1 -194.76
2 2 140.20
3 4 83.46
4 6 -16.52
5 8 -22.86
6 10 30.97
7 12 24.49
8 14 56.70
9 16 -21.71
10 18 24.63
11 21 -26.43
12 22 69.47
13 24 50.30

(Numerical example 4)
Unit mm

Surface data surface number rd nd νd Effective diameter
1 119.112 2.00 1.94595 18.0 46.08
2 63.888 6.06 1.69680 55.5 44.47
3 1050.812 0.15 43.79
4 36.880 5.34 1.69680 55.5 40.87
5 143.627 (variable) 40.40
6 72.821 1.16 1.88300 40.8 24.35
7 12.770 5.70 18.60
8 -28.799 1.16 1.88300 40.8 17.50
9 63.191 0.13 18.21
10 29.919 3.12 1.94595 18.0 18.31
11 -54.899 2.75 18.08
12 * -20.920 0.93 1.85400 40.4 16.45
13 -90.252 (variable) 16.46
14 * 21.679 3.74 1.69680 55.5 16.42
15 90.714 0.12 15.80
16 19.575 7.47 1.59282 68.6 15.40
17 -50.307 0.12 13.26
18 62.201 0.70 1.84666 23.8 12.67
19 * 15.943 0.12 11.94
20 15.788 4.18 1.48749 70.2 11.94
21 -101.480 1.16 11.09
22 (Aperture) ∞ (Variable) 10.43
23 272.154 0.70 1.69680 55.5 11.51
24 17.400 2.09 1.84666 23.8 11.79
25 21.457 (variable) 11.96
26 -22.110 0.75 1.58913 61.1 13.96
27 -30.237 (variable) 14.71
28 * 21.727 4.89 1.48749 70.2 17.78
29 2085.623 (variable) 18.65
Image plane ∞

Aspheric data 12th surface
K = 8.58338e-001 A 4 = 5.57146e-006 A 6 = 6.59697e-008 A 8 = -9.18752e-010 A10 = 8.56606e-012

14th page
K = -1.76906e-001 A 4 = -3.03720e-006 A 6 = -6.37897e-008 A 8 = -1.81295e-010

19th page
K = 6.24337e-001 A 4 = 4.57564e-005 A 6 = 2.09637e-007 A 8 = -1.19599e-009 A10 = 1.23599e-011

28th page
K = 0.00000e + 000 A 4 = -2.30829e-005 A 6 = 1.71728e-008 A 8 = 9.53180e-011 A10 = -2.74176e-013

Various data Zoom ratio 4.71
Wide angle Medium Telephoto focal length 18.04 41.76 84.96
F number 2.94 5.00 6.00
Half angle of view (degrees) 33.19 18.04 9.09
Image height 11.80 13.60 13.60
Total lens length 96.81 108.02 120.68
BF 11.81 22.76 25.78

d 5 0.58 10.81 20.53
d13 16.27 6.29 1.28
d22 2.62 8.56 14.47
d25 10.43 4.39 3.52
d27 0.58 0.69 0.58
d29 11.81 22.76 25.78

Entrance pupil position 28.15 55.67 107.37
Exit pupil position -23.83 -20.63 -24.33
Front principal point position 37.06 57.24 48.30
Rear principal point position -6.23 -18.99 -59.18

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
L 1 1 57.22 13.55 2.62 -5.27
L 2 6 -10.33 14.95 3.25 -7.11
L 3 14 17.23 17.59 2.05 -10.07
L 4 23 -36.03 2.78 2.06 0.49
L 5 26 -144.60 0.75 -1.34 -1.83
L 6 28 45.00 4.89 -0.03 -3.32

Single lens Data lens Start surface Focal length
1 1 -148.28
2 2 97.38
3 4 69.78
4 6 -17.70
5 8 -22.27
6 10 20.84
7 12 -32.09
8 14 39.99
9 16 24.76
10 18 -25.50
11 20 28.36
12 23 -26.71
13 24 87.97
14 26 -144.60
15 28 45.00

(Numerical example 5)
Unit mm

Surface data surface number rd nd νd Effective diameter
1 121.583 2.00 1.95906 17.5 51.76
2 84.348 5.23 1.65160 58.5 50.79
3 422.840 0.15 50.27
4 71.631 5.23 1.69680 55.5 49.01
5 265.791 (variable) 48.02
6 70.094 1.16 1.88300 40.8 22.67
7 15.605 8.13 19.12
8 -47.418 1.16 1.88300 40.8 16.64
9 27.608 0.14 16.23
10 25.232 4.07 1.94595 18.0 16.32
11 -93.240 2.90 15.89
12 * -20.316 0.93 1.85400 40.4 14.92
13 -56.484 (variable) 15.11
14 * 20.935 3.89 1.69680 55.5 20.00
15 90.752 0.12 19.80
16 18.904 7.16 1.59282 68.6 19.74
17 * -49.660 0.12 18.14
18 146.350 0.70 1.84666 23.8 16.86
19 * 16.605 0.12 15.31
20 16.637 3.92 1.48749 70.2 15.30
21 227.653 1.16 14.63
22 (Aperture) ∞ (Variable) 14.18
23 90.936 0.70 1.69680 55.5 13.56
24 16.850 2.16 1.84666 23.8 13.01
25 25.949 (variable) 12.44
26 * 19.340 4.51 1.48749 70.2 15.05
27 40.866 (variable) 15.50
Image plane ∞

Aspheric data 12th surface
K = 8.45178e-001 A 4 = 1.06946e-005 A 6 = 1.08298e-007 A 8 = -1.46754e-009 A10 = 1.06096e-011

14th page
K = -1.01557e-001 A 4 = -9.86956e-007 A 6 = -5.37777e-008 A 8 = -1.81132e-010

17th page
K = 0.00000e + 000 A 4 = 1.64322e-007 A 6 = 2.44785e-009 A 8 = 3.71577e-011

19th page
K = 6.64216e-001 A 4 = 5.12752e-005 A 6 = 2.31786e-007 A 8 = -9.64526e-010 A10 = 1.35649e-011

26th page
K = 0.00000e + 000 A 4 = -2.38114e-005 A 6 = -1.05031e-007 A 8 = 2.07890e-009 A10 = -1.26701e-011

Various data Zoom ratio 6.67
Wide angle Medium telephoto focal length 20.92 40.04 139.44
F number 2.70 5.00 6.00
Half angle of view (degrees) 29.43 18.76 5.57
Image height 11.80 13.60 13.60
Total lens length 104.42 128.13 178.50
BF 22.11 34.62 57.58

d 5 0.35 17.40 50.04
d13 12.95 7.23 1.22
d22 1.16 5.68 11.78
d25 12.20 7.56 2.24
d27 22.11 34.62 57.58

Entrance pupil position 26.49 59.39 218.03
Exit pupil position -20.14 -18.83 -17.51
Front principal point position 37.05 69.44 98.53
Rear principal point position 1.19 -5.41 -81.86

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
L 1 1 101.90 12.61 1.31 -6.10
L 2 6 -11.28 18.49 4.69 -8.10
L 3 14 19.28 17.18 0.13 -10.86
L 4 23 -65.07 2.86 3.11 1.46
L 5 26 70.48 4.51 -2.55 -5.39

Single lens Data lens Start surface Focal length
1 1 -294.93
2 2 160.73
3 4 139.19
4 6 -22.96
5 8 -19.62
6 10 21.35
7 12 -37.60
8 14 38.18
9 16 24.03
10 18 -22.18
11 20 36.60
12 23 -29.80
13 24 51.20
14 26 70.48

(Numerical example 6)
Unit mm

Surface data surface number rd nd νd Effective diameter
1 82.061 2.00 1.94595 18.0 54.41
2 64.952 6.39 1.69680 55.5 52.40
3 197.091 0.17 50.70
4 52.740 6.39 1.69680 55.5 46.69
5 199.204 (variable) 44.50
6 69.349 1.16 1.88300 40.8 27.15
7 14.169 8.13 20.78
8 -31.851 1.16 1.88300 40.8 18.60
9 42.979 0.14 18.07
10 28.750 4.07 1.94595 18.0 18.14
11 -79.751 2.90 17.56
12 * -20.862 0.93 1.85400 40.4 16.18
13 -78.899 (variable) 16.25
14 * 20.839 3.89 1.69680 55.5 18.11
15 110.853 0.12 17.92
16 19.441 7.16 1.59282 68.6 17.98
17 * -46.577 0.12 16.82
18 140.401 0.70 1.84666 23.8 16.03
19 * 16.605 0.93 14.95
20 16.948 3.92 1.48749 70.2 15.18
21 82.499 1.16 14.90
22 (Aperture) ∞ (Variable) 14.83
23 60.010 0.70 1.69680 55.5 14.63
24 19.417 2.16 1.84666 23.8 14.71
25 30.372 (variable) 14.67
26 * 19.485 4.51 1.48749 70.2 16.45
27 47.581 (variable) 16.83
Image plane ∞

Aspheric data 12th surface
K = 8.45178e-001 A 4 = 5.61235e-006 A 6 = 7.38976e-008 A 8 = -1.36678e-009 A10 = 1.21717e-011

14th page
K = -1.01557e-001 A 4 = -2.30964e-006 A 6 = -6.73536e-008 A 8 = -1.92801e-010

17th page
K = 0.00000e + 000 A 4 = -2.07297e-006 A 6 = 1.33384e-008

19th page
K = 6.64216e-001 A 4 = 5.12752e-005 A 6 = 2.31786e-007 A 8 = -9.64526e-010 A10 = 1.35649e-011

26th page
K = 0.00000e + 000 A 4 = -2.49565e-005 A 6 = -1.08741e-008 A 8 = 1.75267e-010 A10 = -5.90330e-013

Various data Zoom ratio 4.85
Wide angle Medium Telephoto focal length 17.91 38.92 86.94
F number 2.50 5.00 6.00
Half angle of view (degrees) 33.37 19.26 8.89
Image height 11.80 13.60 13.60
Total lens length 103.92 123.56 165.08
BF 17.32 30.81 76.05

d 5 1.19 13.28 15.33
d13 13.97 6.61 1.22
d22 1.16 10.67 11.62
d25 11.47 3.39 2.05
d27 17.32 30.81 76.05

Entrance pupil position 31.92 63.56 70.34
Exit pupil position -19.71 -19.67 -18.79
Front principal point position 41.17 72.47 77.58
Rear principal point position -0.59 -8.11 -10.89

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
L1 1 72.05 14.95 1.07 -7.62
L2 6 -9.77 18.49 4.58 -7.95
L3 14 19.85 17.99 -0.07 -11.81
L4 23 -127.84 2.86 5.21 3.49
L5 26 64.31 4.51 -2.00 -4.88

Single lens Data lens Start surface Focal length
1 1 -349.17
2 2 136.33
3 4 101.13
4 6 -20.37
5 8 -20.57
6 10 22.75
7 12 -33.46
8 14 36.19
9 16 24.11
10 18 -22.30
11 20 42.91
12 23 -41.49
13 24 58.32
14 26 64.31

L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group L5 5th lens group L6 6th lens group
VC anti-vibration group

Claims (8)

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, an intermediate group having one or more lens groups, and a final lens group having a positive refractive power, A zoom lens in which the interval between adjacent lens groups changes during zooming,
The intermediate group includes an anti-vibration group having a negative refractive power that moves in a direction having a component perpendicular to the optical axis during image blur correction. The anti-vibration group includes a negative lens and a positive lens or a single lens. Consists of a negative lens,
The focal length of the entire system at the telephoto end is ft, the lateral magnification of the image stabilization group at the telephoto end is βvct, the lateral magnification at the telephoto end of the optical system located on the image side of the image stabilization group is βrt, The focal length is fvc, the radius of curvature of the lens surface closest to the object side of the image stabilization group is Rf, the radius of curvature of the lens surface closest to the image side of the image stabilization group is Rr, and the focal length of the first lens group is f1. When the focal length of the third lens group located closest to the object side of the intermediate group is f3,
0.8 <ft / (| (1-βvct) × βrt × fvc |) <2.9
0.3 <(Rf−Rr) / (Rf + Rr) <1.0
3.0 <f1 / f3 <5.5
A zoom lens satisfying the following conditional expression: When the focal length of the second lens group is f2,
4.0 <f1 / | f2 | <9.5
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. 0.4 <f1 / | fvc | <2.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   4. The zoom lens according to claim 1, wherein the third lens group includes two or more positive lenses and one or more negative lenses. 5. When the focal length of the final lens group is fp,
0.45 <fp / ft <1.20
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   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 positive refractive power, a fourth lens group having a negative refractive power, and a positive lens 2. The zoom lens according to claim 1, further comprising a fifth lens unit having a refractive power, wherein each lens unit moves along a different locus during zooming, and the anti-vibration unit is the whole or a part of the fourth lens unit. 6. The zoom lens according to any one of 5 above.   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 positive refractive power, a fourth lens group having a negative refractive power, and a negative lens group The lens unit includes a fifth lens unit having a refractive power and a sixth lens unit having a positive refractive power, and each lens unit moves along a different path during zooming, and the image stabilization group is the fourth lens group. The zoom lens according to any one of claims 1 to 5.   An image pickup apparatus comprising: the zoom lens according to claim 1; and a solid-state image pickup device that receives an image formed by the zoom lens.