JP2002244037A - Variable power optical system having vibrationproof function and optical equipment using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a zoom lens having a vibrationproof function by which the shake of a photographed image due to vibration is corrected while excellently maintaining optical performance and to provide an optical equipment using it. SOLUTION: This variable power optical system possesses, in the following order from the object side, a first lens group of positive refracting power which is fixed at the time of power variation and focusing, a second lens group of negative refracting power having a variable power function, a third lens group of the positive refracting power and a fourth lens group of the positive refracting power by which an image surface fluctuated by the power variation is corrected and which has a focusing function. The third lens group possesses at least a 31st lens group having the negative refracting power and a 32nd lens group having the positive refracting power. The shake of the photographed image caused when the variable power optical system is vibrated is corrected by moving the 32nd lens group in a direction perpendicular to the optical axis. Moreover, an axial distance D23 between the second group and the third group at a telephoto end and the focal length f31 an f32 of the 31st lens group and the 32nd lens are appropriately set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable power optical system having an image stabilizing function and an optical apparatus using the same, and more particularly, to moving a part of a lens group of the variable power optical system in a direction perpendicular to an optical axis. Thereby, a still image is obtained by optically correcting the blur of the captured image when the variable power optical system vibrates (tilts),
The present invention is suitable for a video camera, an electronic still camera, an electronic camera compatible with 3-CCD, a film camera, and the like that aim at stabilizing a captured image.

[0002]

2. Description of the Related Art When an image is taken from a moving object such as a car or an aircraft in progress, vibration is transmitted to an image taking system, resulting in camera shake and blurring of the taken image. Conventionally, various image stabilizing optical systems having a function of preventing a blur of a captured image at this time by decentering a part of a lens group of the imaging system in parallel have been proposed.

For example, in Japanese Patent Application Laid-Open Nos. 1-116619 and 2-124521, vibration of a photographing system is detected using an acceleration sensor or the like, and a part of the photographing system is detected in accordance with a signal obtained at this time. A still image is obtained by vibrating the lens group in a direction perpendicular to the optical axis.

In Japanese Patent Application Laid-Open No. Hei 7-128619, the first positive refractive power which is fixed during zooming and focusing in order from the object side.
Group, a second group of negative refractive power having a zooming function, an aperture stop,
A zoom lens having four lens groups, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power having both a correction function and a focusing function for correcting an image plane which fluctuates due to zooming. An optical system, wherein the third unit includes two lens units, a first unit having a negative refractive power and a second unit having a positive refractive power. The third unit is moved in a direction perpendicular to the optical axis. The shake of the captured image when the variable magnification optical system vibrates is corrected.

In Japanese Patent Application Laid-Open No. 7-199124,
Vibration reduction is performed by vibrating the entire third lens unit of the variable power optical system having a four-unit configuration including lens units having negative, positive, and positive refractive powers.

[0006] In JP-A-11-237550,
By vibrating a part of the third lens group of the four-unit variable power optical system including the lens units having positive, negative, positive, and positive refractive power, the size of the optical system compatible with the 3-CCD and high image quality are improved. And a variable-power optical system that realizes both

[0007]

Generally, in an optical system in which some lenses of a photographing system are decentered parallel to the optical axis in a direction perpendicular to the optical axis to perform image stabilization, an extra extra lens is required for image stabilization. Although there is an advantage that an optical system is not required, there is a problem in that a space for a lens to be moved is required, and an amount of eccentric aberration generated during image stabilization increases.

[0008] In recent years, the 3-CCD system has been adopted in some cameras for consumer video cameras in order to improve image quality. 3- In a four-unit variable-magnification optical system composed of lens units having positive, negative, positive, and positive refractive power corresponding to a CCD, a relatively small and light-weight lens group constituting a part of the variable-magnification optical system is replaced with an optical axis. When the optical system is configured to move in the vertical direction to correct image blurring when the variable power optical system is vibrated (tilted), it is possible to reduce the size of the entire apparatus, simplify the mechanism, and reduce the load on the driving unit. In addition to satisfactorily correcting the eccentric aberration when the lens group is decentered while reducing the vibration, the sensitivity of the eccentric lens group for vibration reduction is increased to reduce the size of the entire optical system. It is possible to provide a variable power optical system having a function.

On the other hand, as the density of CCDs increases, a high resolution frequency is required for a photographing system. When the resolution frequency generally required becomes higher, when the aperture diameter is reduced or when the aperture diameter becomes an aperture opening far from a perfect circle, image degradation due to diffraction cannot be ignored.

As a method for solving this problem, a method of adopting an iris diaphragm or a method of inserting an ND filter into an optical path to minimize the influence of diffraction is adopted. However, in this method, the size of the optical system is likely to be increased due to a complicated diaphragm mechanism and an increase in an axial interval required for inserting the ND filter into the optical path.

According to the present invention, a relatively small and light lens group constituting a part of a variable power optical system is moved in a direction perpendicular to the optical axis, and image blur when the variable power optical system is vibrated is improved. A zoom optical system having an image stabilizing function capable of correcting while maintaining image quality, simplifying the mechanism, and reducing the size of the entire optical system, and an optical system using the same. The purpose is to provide equipment.

[0012]

According to the first aspect of the present invention, there is provided a zoom lens having an image stabilizing function, in order from the object side, a first lens unit having a positive refractive power fixed during zooming and focusing. A second lens unit having a negative refractive power having a doubling function, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power which corrects an image plane which fluctuates due to zooming and has a focusing function. Having the third
The lens group has a 31st lens group having a negative refractive power and a 32nd lens group having a positive refractive power. The 32nd lens group was moved in a direction perpendicular to the optical axis, and the variable power optical system vibrated. The blurring of the photographed image at the time is corrected, the axial distance at the telephoto end of the second lens group and the third lens group is D23, and the focal lengths of the 31st lens group and the 32 lens are f31 and f32, respectively. In this case, the following conditional expression is satisfied: 0.15 <| D23 / f31 | <0.350.2 <| D23 / f32 | <0.5

According to a second aspect of the present invention, in the first aspect of the present invention, the third lens group includes a third lens unit having a negative refractive power in order from the object side.
It is characterized by comprising one lens group and a 32nd lens group having a positive refractive power.

A third aspect of the present invention is characterized in that, in the second aspect of the present invention, the 32nd lens group includes, in order from the object side, a positive lens, a negative lens, and a positive lens.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the focal length of the second lens group is set to f.
2. Set the focal length of the entire system at the wide-angle end and the telephoto end to f
w and ft

[0016]

(Equation 2)

It is characterized by satisfying the following conditions.

According to a fifth aspect of the present invention, in the first aspect, the 32nd lens group includes, in order from the object side, a positive meniscus lens having a convex surface facing the object side, a negative meniscus lens having a concave surface facing the image surface side, and It is characterized in that both lens surfaces are composed of convex positive lenses.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the thirty-first lens group includes, in order from the object side, a negative lens having both concave surfaces and a positive lens having both convex surfaces. .

According to a seventh aspect of the present invention, in the sixth aspect, the second lens group includes a negative meniscus lens having a concave surface facing the image side in order from the object side, a negative lens having a concave surface facing the object side,
It is characterized in that both lens surfaces comprise a positive lens having a convex surface, and both lens surfaces comprise a negative lens having a concave surface.

According to an eighth aspect of the present invention, there is provided an optical apparatus including the zoom lens having a vibration-proof function according to any one of the first to seventh aspects.

[0022]

FIG. 1 is a schematic diagram showing a paraxial refractive power arrangement of a zoom lens according to the present invention.

FIG. 2 is a sectional view of a zoom lens according to a numerical embodiment 1 of the present invention, which will be described later. FIGS. 3 to 5 are wide-angle ends and intermediate zoom positions of an object at infinity according to the numerical embodiment 1 of the present invention. 4 is an aberration diagram at a telephoto end. FIG.

FIG. 6 is a sectional view of a zoom lens according to a second embodiment of the present invention, which will be described later. FIGS. 7 to 9 are wide-angle ends and intermediate zoom positions of an object at infinity according to the second embodiment of the present invention. 4 is an aberration diagram at a telephoto end. FIG.

FIG. 10 is a sectional view of a zoom lens according to a third embodiment of the present invention, which will be described later. FIGS. 11 to 13 are wide-angle ends and intermediate zoom positions of an object at infinity according to a third embodiment of the present invention. 4 is an aberration diagram at a telephoto end. FIG.

In FIG. 1 and the lens sectional view, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, L3 is a third lens group having a positive refractive power, and L4 is a positive lens. This is a fourth lens unit having a refractive power.

The third lens unit L3 includes a 31st lens unit L31 having a negative refractive power and a 32nd lens unit L32 having a positive refractive power.

In this embodiment, the movement of the 32nd lens unit L32 in the direction perpendicular to the optical axis corrects the blur of the photographed image when the entire optical system vibrates (tilts).

SP denotes an aperture stop, and the third lens unit L3
Is located in front of. G denotes a face plate, a filter, color separation means, and the like, and is shown as a glass block. IP is an image plane, on which imaging means such as a CCD, a film, and the like are arranged.

In the present embodiment, the second lens group is moved to the image plane side as indicated by an arrow at the time of zooming from the wide angle end to the telephoto end, and the fourth lens group is moved to change the image plane due to zooming. Has been corrected.

Also, a rear focus type is employed in which the fourth lens group is moved on the optical axis to perform focusing. A solid curve 4a and a dotted curve 4b of the fourth lens group shown in FIG. 1 are image plane fluctuations during zooming from the wide-angle end to the telephoto end when focusing on an object at infinity and an object at a short distance, respectively. Is shown for correcting the movement trajectory. The first
The lens group and the third lens group are fixed during zooming and focusing.

In the present embodiment, the fourth lens group is moved to correct the image plane fluctuation caused by zooming, and the fourth lens group is moved for focusing. In particular, as shown by the curves 4a and 4b in the figure, the zoom lens is moved so as to have a convex trajectory toward the object side when zooming from the wide-angle end to the telephoto end.

As a result, the space between the third lens unit and the fourth lens unit is effectively used, and the overall length of the lens is effectively reduced. In this embodiment, for example, when focusing from an object at infinity to an object at a short distance at the telephoto end, focusing is performed by extending the fourth lens unit forward as shown in FIG. 4C.

The zoom lens according to the present embodiment converts a virtual image formed by a combined system of the first lens unit and the second lens unit into a third image.
A zoom method is used in which an image is formed on the photosensitive surface (on the surface of the imaging means) by the lens group and the fourth lens group.

In the present embodiment, the rear focus method described above is employed to reduce the lens effective diameter of the first lens group, as compared with a conventional so-called four-group zoom lens in which the first group is extended and focused. The increase is effectively prevented.

By disposing the aperture stop immediately before the third lens group, in the third lens group, or between the third lens group and the fourth lens group, the variation in aberration due to the movable lens group is reduced, and Front lens diameter (effective system of the first lens group) by shortening the distance between the lens group and the aperture stop
Is easily achieved.

In the numerical embodiment of the zoom lens according to the present invention, the third lens unit L3 is replaced by the 31st lens unit L having a negative refractive power.
31 and a 32nd lens unit L32 having a positive refractive power are composed of two lens units, of which, when the 32nd lens unit L32 is moved in the direction perpendicular to the optical axis for image stabilization and the entire optical system vibrates. Image blur is corrected. Thus, image stabilization is performed without newly adding an optical member such as a variable apex angle prism or a lens group for image stabilization.

Next, the optical principle of an image stabilizing system for correcting blurring of a photographed image by moving a lens group in a direction perpendicular to the optical axis in a variable power optical system according to the present invention will be described.

Now, the optical axis is θ °, the shift amount of the shift lens group (the lens group that moves in the direction perpendicular to the optical axis) necessary for correcting image blur in the direction orthogonal to the optical axis is Δ, Assuming that the focal length of the entire system is f and the eccentric sensitivity of the shift lens group is TS, the moving amount Δ is given by the following equation.

Δ = f · tan (θ) / TS If the eccentricity sensitivity TS of the shift lens group is too small, the moving amount Δ becomes a large value, and the moving amount of the shift lens group necessary for image stabilization becomes too large. The lens diameter becomes large.

In particular, a photographing lens for a 3-CCD compatible video camera requires a space for arranging a color separation prism for color separation on the image plane side, so that the back lens is longer than an ordinary single-plate photographing lens. Focus is needed. For this reason, the refractive power of the third lens group becomes weaker than that of the fourth lens group, and the eccentric sensitivity in the direction perpendicular to the optical axis of the third lens group decreases. Therefore, when the image stabilization is performed by moving the entire third lens group in the direction perpendicular to the optical axis direction, the movement amount of the third lens group becomes too large.

Therefore, in the present invention, the third lens group having a positive refractive power is divided into a 31 lens group having a negative refractive power and a 32 lens group having a positive refractive power. However, the positive refracting power of the shift lens group 32 is increased, and the eccentricity sensitivity TS is also increased, thereby achieving a compact anti-vibration optical system as a whole with a 3-CCD compatible camera.

In the zoom type of the present invention, the distance between the second lens unit and the third lens unit is minimized at the telephoto end. At this time, the diaphragm disposed on the object side of the third lens unit. It is important that the mechanism and the second lens group do not interfere in arrangement. In particular, in a photographing system for the purpose of improving image quality, blurring can be improved by employing an iris diaphragm having a large number of diaphragm blades.

Further, in order to add a mechanism for moving an ND filter for adjusting the amount of light into and out of the optical path, the distance between the second lens group and the third lens group sandwiching the diaphragm is determined by the distance between the second lens group and the third lens group. Expanded to allow placement.

In the present invention, the second lens unit and the third lens unit are used in order to realize a high optical performance while ensuring a sufficient space before and after the stop.
When the axial distance at the telephoto end of the group is D23, and the focal lengths of the 31st lens group and the 32nd lens are f31 and f32, respectively, 0.15 <| D23 / f31 | <0.35 (1) 0 .2 <| D23 / f32 | <0.5 (2)

Conditional expression (1) relates to the refractive power (the reciprocal of the focal length) of the 31st lens group. Conditional expression (1)
If the refractive power of the 31st lens group is smaller than the lower limit of the condition (1), it is difficult to secure a long back focus, and conversely, the refractive power of the 31st lens group will be too strong beyond the upper limit of conditional expression (1). And the overall length of the lens increases.

Condition (2) relates to the refractive power of the 32nd lens group. If the refractive power of the 32 lens unit is increased beyond the lower limit of the conditional expression (2), the eccentricity sensitivity is also increased, and the remaining amount of the image stabilization due to the influence of the mechanical error increases. Conversely, if the refractive power of the 32nd lens group is reduced below the upper limit, the amount of movement of the 32nd lens group required for image stabilization becomes too large, and members such as actuators for driving the 32nd lens group also become large.

In the present invention, it is more preferable to set the numerical ranges of the conditional expressions (1) and (2) as follows.

0.18 <| D23 / f31 | <0.33 0.24 <| D23 / f32 | <0.47 As described above, according to the present embodiment, the optics with a sufficient distance before and after the stop are provided. In the system, a relatively small and light thirty-second lens group constituting a part of the variable power optical system is moved in a direction perpendicular to the optical axis, and image blurring when the variable power optical system vibrates (tilts) is reduced. By configuring so as to correct, the amount of eccentric aberration generated when the 32nd lens group is decentered is reduced while the size of the entire apparatus is reduced, the mechanism is simplified, and the load on the driving unit is reduced. This achieves a variable power optical system having an anti-vibration function in which aberrations are satisfactorily corrected.

The zoom lens according to the present invention can achieve the initial object by adopting the above-mentioned configuration.
Further, in order to reduce the fluctuation of the eccentric aberration at the time of image stabilization and obtain good optical performance, it is preferable to satisfy at least one of the following configurations according to the purpose. The 32nd lens group is composed of a variable power optical system having an anti-vibration function according to claim 2, characterized by comprising, in order from the object side, a positive lens, a negative lens, and a positive lens. When the focal length of the second lens group is f2, and the focal lengths of the entire system at the wide-angle end and the telephoto end are fw and ft, respectively.

[0051]

(Equation 3)

The following condition must be satisfied.

If the refractive power of the second lens unit becomes too strong below the lower limit of the conditional expression (3), it is advantageous for shortening the overall length of the lens, but it is necessary to correct the variation of the field curvature and the distortion over the entire zoom range. Is not good because it becomes difficult. If the upper limit of conditional expression (3) is exceeded and the refractive power of the second lens group is too weak, the amount of movement of the second lens group necessary for zooming will be too large, which is not good.

In the present invention, it is more preferable to set the numerical range of the conditional expression (3) as follows.

[0055]

(Equation 4)

The 31st lens group is composed of a negative lens having both concave lens surfaces and a positive lens having both convex lens surfaces, and the 32nd lens group has a convex surface having a stronger refractive power directed toward the object side than the image surface side. A positive meniscus lens, a negative meniscus lens having a concave surface having a stronger refractive power on the image surface side than the object side, and a positive lens having both lens surfaces convex.

According to this, the fluctuation of the eccentric aberration at the time of image stabilization can be satisfactorily corrected.非 An aspheric lens is provided on at least one surface of each of the 31st lens group and the 32nd lens group.

According to this, it is easy to reduce various aberrations generated in each lens group and to suppress the deterioration of the optical performance during image stabilization.

In particular, it is preferable to introduce aspherical surfaces into the lens surface closest to the image plane in the 31st lens group and the lens surface closest to the image plane in the 32nd lens group. Spherical aberration and coma aberration are reduced, and it becomes easy to satisfactorily correct eccentric aberrations, particularly eccentric coma, which occur during image stabilization.

Incidentally, the position of the aspherical surface may be a different lens surface of each lens group. ３２ The 32nd lens group having a positive refractive power as the shift lens group has one or more negative lenses.

In order to correct the chromatic aberration of magnification when the 32nd lens group is decentered for image stabilization and the field curvature due to the decentering, the chromatic aberration is corrected as much as possible by the shift lens group alone. It is desirable that the Petzval sum is small. Therefore, it is effective to include at least one negative lens in the shift lens group (the 32nd lens group) in order to correct chromatic aberration and reduce Petzval sum.

At this time, in order to maintain good chromatic aberration of the entire system, it is preferable to include at least one positive lens in the 31st lens group other than the 32nd lens group. ◎ The second lens group includes, in order from the object side, a negative meniscus lens having a concave surface facing the image surface side, a negative lens having a concave surface facing the object side, a positive lens having both lens surfaces convex, and a negative lens having both lens surfaces concave. It is good to configure.

According to this, it becomes easy to satisfactorily correct lateral chromatic aberration over the entire zoom range. It is desirable that the fourth lens group includes at least one negative lens and two positive lenses, and has at least one aspheric surface.

According to this, the present invention is applied to a camera compatible with 3-CCD. When the back focus is extended, the refracting power of the fourth lens unit is increased, and the height at which an axial ray passes through the fourth lens unit is increased. Therefore, it is easy to satisfactorily correct the occurrence of spherical aberration. The fourth lens group is composed of a positive lens having both lens surfaces convex, a negative meniscus lens having a convex surface facing the object side, and a positive lens having both lens surfaces convex.

Next, numerical examples of the present invention will be described. In the numerical examples, Ri is the radius of curvature of the i-th surface in order from the object side, Di is the i-th lens thickness and air spacing in order from the object side, and Ni and νi are the i-th optical members in order from the object side. Are the refractive index and Abbe number of the material. Table 1 shows the relationship between the above-mentioned conditional expressions and the numerical examples.

The aspheric surface has an X-axis in the optical axis direction, an H-axis in a direction perpendicular to the optical axis, a positive traveling direction of light, and R as a radius of curvature of a gold axis.
When A, B, C, D, and E are each aspheric coefficients

[0067]

(Equation 5)

This is represented by the following equation.

[Ex] means [x10 ^-X ].

[0070]

[Outside 1]

[0071]

[Outside 2]

[0072]

[Outside 3]

[0073]

[Table 1]

Next, an embodiment of a video camera using a zoom lens having an image stabilizing function according to the present invention will be described with reference to FIG.

In FIG. 14, reference numeral 10 denotes a video camera main body, reference numeral 11 denotes the above-described zoom lens of the present invention, reference numeral 12 denotes an image pickup device such as a CCD for receiving a subject image by the zoom lens 11, and reference numeral 13 denotes a subject image received by the image pickup device 12. Is a finder for observing a subject image displayed on a display element (not shown).

The display device is constituted by a liquid crystal panel or the like, and displays an object image formed on the image pickup device 12. Reference numeral 15 denotes a liquid crystal display panel having the same function as the finder.

As described above, by applying the zoom lens of the present invention to an optical device such as a video camera, a compact optical device having high optical performance is realized.

[0078]

According to the present invention, a relatively small and light lens group constituting a part of the variable power optical system is moved in the direction perpendicular to the optical axis, and an image obtained when the variable power optical system vibrates is obtained. While maintaining high image quality for blurring, and while simplifying the mechanism,
In addition, it is possible to achieve a variable power optical system having an image stabilizing function capable of performing correction while reducing the size of the entire optical system, and an optical apparatus using the same.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a paraxial refractive power arrangement of a variable power optical system according to the present invention.

FIG. 2 is a sectional view of a zoom lens according to Numerical Example 1 of the present invention;

FIG. 3 is an aberration diagram at a wide-angle end when focusing on an object at infinity according to Numerical Example 1 of the present invention.

FIG. 4 is an aberration diagram at an intermediate zoom position when focusing on an object at infinity according to Numerical Example 1 of the present invention;

FIG. 5 is an aberration diagram at a telephoto end when focusing on an object at infinity according to Numerical Example 1 of the present invention.

FIG. 6 is an aberration diagram at a telephoto end when focusing on an object at infinity according to Numerical Example 2 of the present invention.

FIG. 7 is an aberration diagram at a telephoto end when focusing on an object at infinity according to Numerical Example 2 of the present invention.

FIG. 8 is an aberration diagram at a telephoto end when focusing on an object at infinity according to Numerical Example 2 of the present invention.

FIG. 9 is an aberration diagram at a telephoto end when focusing on an object at infinity according to Numerical Example 2 of the present invention.

FIG. 10 is an aberration diagram at a telephoto end when focusing on an object at infinity according to Numerical Example 3 of the present invention.

FIG. 11 is an aberration diagram at a telephoto end when focusing on an object at infinity according to Numerical Example 3 of the present invention.

FIG. 12 is an aberration diagram at a telephoto end when focusing on an object at infinity according to Numerical Example 3 of the present invention.

FIG. 13 is an aberration diagram at a telephoto end when focusing on an object at infinity according to Numerical Example 3 of the present invention.

FIG. 14 is a schematic view of an embodiment of the optical apparatus of the present invention.

[Explanation of symbols]

 L1 First lens group L2 Second lens group L3 Third lens group L4 Fourth lens group L31 31st lens group L32 32nd lens group SP Stop G Glass block IP Image plane d d-line g g-line ΔM Meridional image plane ΔS sagittal Image plane

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 2H087 KA02 KA03 MA15 NA07 PA11 PA16 PA20 PB14 PB15 PB16 QA02 QA07 QA17 QA21 QA25 QA34 QA42 QA45 RA05 RA12 RA13 RA32 RA42 SA23 SA27 SA29 SA32 SA63 SA64 SA65 SA72 SB04 SB15 SB

Claims (8)

[Claims] 1. A first lens unit having a fixed positive refractive power, a second lens unit having a negative refractive power having a zooming function, and a positive refractive power, which are fixed during zooming and focusing in order from the object side. A third lens group, a fourth lens group having a positive refractive power having a function of correcting an image plane changed by zooming and having a focusing function, and the third lens group is a 31st lens group having a negative refractive power And a 32nd lens group having a positive refracting power. The 32nd lens group is moved in the direction perpendicular to the optical axis to correct the blur of the photographed image when the variable magnification optical system vibrates. The axial distance between the lens unit and the third lens unit at the telephoto end is D23, and the 31st lens unit and the 32nd lens unit are
When the focal lengths of the lenses are f31 and f32, respectively, the following conditional expression is satisfied: 0.15 <| D23 / f31 | <0.350.2 <| D23 / f32 | <0.5 Variable power optical system with anti-vibration function. 2. The apparatus according to claim 1, wherein the third lens group includes a 31st lens group having a negative refractive power and a 32nd lens group having a positive refractive power in order from the object side. Variable power optical system with anti-vibration function. 3. The variable power optical system according to claim 2, wherein the 32nd lens group includes, in order from the object side, a positive lens, a negative lens, and a positive lens. 4. The focal length of the second lens group is f2, and the focal lengths of the entire system at the wide-angle end and the telephoto end are fw and ft, respectively.
Where 4. A variable power optical system having an image stabilizing function according to claim 1, wherein the variable power optical system satisfies the following condition. 5. The 32nd lens group includes, in order from the object side, a positive meniscus lens having a convex surface facing the object side, a negative meniscus lens having a concave surface facing the image surface side, and a positive lens having both lens surfaces convex. The zoom lens having an image stabilizing function according to claim 1. 6. The anti-vibration function according to claim 5, wherein the 31st lens group includes, in order from the object side, a negative lens with both lens surfaces concave and a positive lens with both lens surfaces convex. Zoom lens. 7. The second lens group includes, in order from the object side, a negative meniscus lens having a concave surface facing the image side, a negative lens having a concave surface facing the object side, a positive lens having both lens surfaces convex, and both lens surfaces. 7. A zoom lens having an image stabilizing function according to claim 6, wherein said lens comprises a concave negative lens. 8. An optical apparatus comprising the zoom lens having the image stabilizing function according to claim 1. Description: