JP2008180964A - Optical system - Google Patents

Abstract

【Task】
To obtain an optical system capable of efficiently performing image stabilization and maintaining a good image even during vibration compensation.
[Solution]
An optical system including a lens portion in which a first shift lens group having a positive refractive power and a second shift lens group having a negative refractive power are disposed adjacent to each other in the optical axis direction, the first shift lens group And the second shift lens group is characterized by shifting an image formed by the optical system in a direction perpendicular to the optical axis by shifting in a direction perpendicular to the optical axis and in a direction opposite to each other.
[Selection] Figure 1

Description

  The present invention relates to an optical system, and is particularly suitable for observation of a telescope, binoculars, a camera finder system, etc., and for imaging of a digital camera, a video camera, or the like.

  If vibration is accidentally transmitted to the optical system for observation or imaging, the resulting image will be blurred. Conventionally, various optical systems having a mechanism (anti-vibration mechanism) for compensating for image blur (image blur) due to this accidental vibration have been proposed. For example, in observation optical systems such as telescopes and binoculars, there are known observation optical systems that compensate for image blur due to vibration by moving a part of the lens groups constituting them in a direction perpendicular to the optical axis, that is, shifting them. (Patent Documents 1 and 2).

  Further, in a telephoto imaging optical system with a long focal length for photographing, image blurring increases when there is camera shake in handheld photographing. For this reason, an imaging optical system in which image blur is corrected by shifting a part of the lens system in a direction perpendicular to the optical axis is known. (Patent Documents 3 and 4).

  In order to obtain an image stabilization effect, at least one lens group may be shifted in a direction perpendicular to the optical axis.

On the other hand, it is known that two movable lens groups (shift lens groups) to be shifted in the direction perpendicular to the optical axis for image blur correction are selected from the optical system in order to effectively perform the image stabilization effect. It has been. An optical system is known in which the two shift lens groups are shifted in the direction perpendicular to the optical axis and opposite to each other to obtain an anti-vibration effect (Patent Documents 5 to 7).
Japanese Patent Laid-Open No. 11-194262 JP 2001-116989 A JP-A-7-270724 JP-A-11-119092 JP-A-2-162330 JP 11-167074 A JP 2006-189627 A

  However, in the prior art, when image stabilization is performed by driving a lens, it has been difficult to maintain high image quality.

  Accordingly, an object of the present invention is to provide an optical system that can easily maintain high image quality even during image stabilization.

The optical system of the present invention is
An optical system including a lens portion in which a first shift lens group having a positive refractive power and a second shift lens group having a negative refractive power are disposed adjacent to each other in the optical axis direction, the first shift lens group The second shift lens group is characterized in that an image formed by the optical system is shifted in a direction perpendicular to the optical axis by shifting in a direction perpendicular to the optical axis and in a direction opposite to each other.

In addition, the optical system of the present invention is
An optical system including a lens unit in which a first shift lens group having a negative refractive power and a second shift lens group having a positive refractive power are disposed adjacent to each other in the optical axis direction, the first shift lens group And at least one of the second shift lens group is composed of a plurality of lenses, and the first shift lens group and the second shift lens group are shifted in a direction perpendicular to the optical axis and in opposite directions to each other. The image formed by the optical system is shifted in a direction perpendicular to the optical axis.

  According to the present invention, it is possible to obtain an optical system that can efficiently perform image stabilization and maintain a good image even during vibration compensation.

  1, 3 and 5 are lens cross-sectional views of Examples 1, 2, and 3 of the optical system of the present invention. 2, 4 and 6 are aberration diagrams of Examples 1, 2, and 3 of the optical system of the present invention.

  The optical systems of Examples 1 and 2 in FIGS. 1 and 3 are observation optical systems such as a telescope, binoculars, and a finder system. The optical system of Example 3 in FIG. 5 is a telephoto imaging optical system suitable for an imaging apparatus such as a still camera, a video camera, or a digital still camera.

  In the lens cross-sectional view, the left side is the object side (light incident side), and the right side is the observation side or image side (light emission side).

  In the optical systems of Examples 1 and 2, a lens in which a first shift lens group (unit) having a positive refractive power and a second shift lens group (unit) having a negative refractive power are disposed adjacent to each other in the optical axis direction. Parts (anti-vibration optical system, anti-vibration unit). The first shift lens group and the second shift lens group shift in the direction perpendicular to the optical axis (vertical direction) and in the opposite directions, thereby shifting the image formed by the optical system in the direction perpendicular to the optical axis. ing. Here, the image (object, object to be observed, etc.) connected by the optical system includes a real image, a virtual image, and an intermediate image connected in the optical system. Further, each of the first shift lens group and the second shift lens group may be configured by one lens (not a bonded lens or the like, but a single lens) as in the first embodiment, or the second embodiment. Each of them may be composed of a plurality of lenses (three or more lenses may be used). Further, either one may be composed of a single lens and the other may be composed of a plurality of lenses. In addition, the first shift lens group and the second shift lens group are disposed adjacent to each other in Examples 1, 2, and 3. However, the present invention is not limited to this, and the lens, diaphragm, optical power (refractive power) is not limited thereto. An optical element (such as a filter) having no force) may be disposed. Further, the “direction perpendicular to the optical axis” means a direction of a straight line perpendicular to the optical axis, and it is desirable that a curve perpendicular to the optical axis is not substantially included. The same applies to all the embodiments of the present application.

  The optical system of Example 3 includes a lens portion in which a first shift lens group having a negative refractive power and a second shift lens group having a positive refractive power are disposed adjacent to each other in the optical axis direction. Each of the first shift lens group and the second shift lens group is composed of two lenses in Example 3, but this is not restrictive. It is sufficient that at least one of the first shift lens group and the second shift lens group is composed of a plurality of lenses (three or more lenses may be used). The first shift lens group and the second shift lens group shift in a direction perpendicular to the optical axis and in opposite directions, thereby shifting an image formed by the optical system in a direction perpendicular to the optical axis.

  First, an example of the binoculars (telescope) of Examples 1 and 2 will be described in detail with reference to FIGS.

  In the lens cross-sectional views of FIGS. 1 and 3, OBJ is an objective lens that connects (forms) an object image (intermediate image).

  P is an erecting prism (image inverting unit) as an image inverting means, and has a function of converting an inverted image (intermediate image) formed by the objective lens OBJ into an erected image. 1 and 3, the erecting prism P is developed and shown as a glass block so that the optical path length can be easily understood. Here, although described as an erect image, in Examples 1 and 3, the erect image is not actually formed. This erecting prism has a function of inverting the light up and down so that a human can observe an erect image rather than an inverted image of an object.

  OCL is an eyepiece (eyepiece), through which an object image converted into an erect image by an erecting prism P is observed.

  IP is an eye point (observation position) and corresponds to the pupil position of the observer.

  The observation optical system has a configuration in which an object image formed by the objective lens OBJ is inverted by an erecting prism P to be an erect image, and the erect image is observed from an eye point IP through an eyepiece lens OCL.

  The objective lens OBJ includes a first lens unit L1 having a positive refractive power that does not move for image stabilization, and a second lens unit having a positive refractive power that shifts in a direction opposite to each other perpendicular to the optical axis during image stabilization. The lens unit L2 includes a third lens unit L3 having a negative refractive power. Here, the second lens group L2 corresponds to the first shift lens group, and the third lens group L3 corresponds to the second shift lens group.

  In FIG. 3, G1 is a protective glass made of parallel plates.

  The second and third lens groups L2 and L3 having the image stabilization function are automatically shifted in directions opposite to each other in the direction perpendicular to the optical axis to displace the image forming position of the objective lens OBJ, and are observed by camera shake. The image blur is corrected.

  In the lens cross-sectional views of FIGS. 1 and 3, (A) is when the movable second and third lens groups L2 and L3 for image stabilization are not decentered, (B) is the second and third lens groups L2, It shows the time when L3 is shifted and eccentric.

  In the lens cross-sectional view (B), the arrows relating to the movable second and third lens groups L2 and L3 indicate the shift direction during image stabilization.

  At the time of focusing, the objective lens OBJ moves integrally.

In the aberration diagrams of FIGS. 2 and 4,
(A) is a longitudinal aberration diagram when the movable second and third lens groups L2 and L3 are not decentered.
FIG. 5B is a lateral aberration diagram at the image center when the movable second and third lens units L2 and L3 are not decentered.
FIG. 6C is a lateral aberration diagram at the image center when the movable second and third lens groups L2 and L3 are decentered.

  2 and 4, the units of the longitudinal aberration diagrams are diopter for spherical aberration and field curvature,% for distortion, and degree chromatic aberration for magnification. The unit of the lateral aberration diagram is degrees. In the figure, d, F, and C represent aberrations of the wavelength d line, F line, and C line, and M and S represent aberrations of the meridional image surface and the sagittal image surface. ω is a half angle of view.

  In many cases, when an observation optical system such as a telescope is looked at by hand, the observation image may be distorted due to camera shake, making it difficult to observe.

  In particular, when the observation magnification of the observation optical system is increased, the shake of the observation image is enlarged due to camera shake, which makes it difficult to observe. Therefore, it is desirable to make the object image formed by the objective lens OBJ as stationary as possible.

  Therefore, in Embodiments 1 and 2, image blur due to camera shake is corrected by shifting the second and third lens groups L2 and L3 constituting the objective lens OBJ as a shift lens group for image stabilization as described above.

  In FIG. 1 and FIG. 3, the image plane of the objective lens OBJ is located in the eyepiece OCL. In other words, the object plane of the eyepiece lens OCL exists inside the eyepiece lens OCL.

  Image blurring occurs when observing the telescope by hand. This image blur is detected by an acceleration sensor or the like, and the image of the objective lens OBJ is shifted by shifting the two lens groups of the second and third lens groups L2 and L3 in directions opposite to each other perpendicular to the optical axis. Image blur is corrected. It is also possible to generate an image shift by a single shift of the third lens unit L3. However, shifting the two lens groups can halve the shift amount of the lens groups when generating the same image shift as compared to shifting the single lens group. This also makes it possible to reduce the lens barrel diameter of the objective lens OBJ. In addition, the second and third lens groups L2 and L3 that shift in opposite directions serve as counter-balance to each other, so that it is possible to reduce the driving load during lens shift.

  In the first and second embodiments, since the refractive power arrangement of the second and third lens units L2L3 gradually converges the light flux, the amount of aberration is small, and the second and third lens units L2 and L3 have a simple configuration. It can be. In addition, since the second and third lens groups L2 and L3 are arranged at positions close to the image plane of the objective lens OBJ, the third lens group L3 is a lens group closest to the image plane of the objective lens OBJ. The diameter of the lens group for use is reduced. Therefore, the configuration of the objective lens OBJ is light and compact, and is suitable for telescopes and binoculars that are held by hand for a relatively long time.

  In Example 2, the third lens group (second shift lens group) L3 is constituted by a cemented lens of a negative lens and a positive lens. That is, at least one of the movable second and third lens groups L2 and L3 is composed of a plurality of lenses. As in the first embodiment, the third lens unit L3 has no practical problem even with a single lens, but in order to further improve the optical performance during shifting, it is better to use a cemented lens. According to this, the occurrence of chromatic aberration and coma generated by shifting the third lens unit L3 in the direction perpendicular to the optical axis can be further suppressed. If the second lens unit L2 is formed of a cemented lens, it is possible to further suppress the amount of aberration generated due to the lens unit shift.

  1 has a magnification of 10 times, an actual field of view of 6 °, an apparent field of view of 60 °, a pupil diameter of Φ3.2, and an eye relief of 14.5 mm.

  The observation optical system for the telescope in FIG. 3 has a magnification of 10 times, an actual field of view of 6.4 °, an apparent field of view of 64 °, a pupil diameter of Φ4.2, and an eye relief of 15 mm.

  A mode when the observation optical systems of Examples 1 and 2 are applied to a telescope is, for example, as follows.

  It has a pitch blur sensor that detects vertical blur and a blur sensor that detects horizontal blur, which are composed of vibration gyro sensors. The two sensors are configured with the sensitivity axes orthogonal. The blur sensor detects angular acceleration and outputs the information as a signal to a microcomputer in the telescope.

  When the microcomputer receives shake (angular acceleration) as information from the shake sensor, it calculates and calculates the shift amounts of the two shift lens groups and outputs them to the lens actuator in the telescope.

  The lens actuator shifts the two shift lens groups based on a signal from the microcomputer.

  An angle sensor is provided, the shift amount of the shift lens group is measured and output to the microcomputer, and when this output matches the value obtained by the calculation, the microcomputer controls to stop driving the lens actuator. Anti-vibration is performed as described above.

  Next, the imaging optical system of Example 3 in FIG. 5 will be described. The imaging optical system in FIG. 5 is a telephoto optical system.

  In FIG. 5, LF is the front group and LR is the rear group. The telephoto imaging optical system according to the third exemplary embodiment includes, in order from the object side to the image side, a first lens unit L1 having a fixed and positive refractive power and a second lens unit L2 having a negative refractive power for performing focusing. LF is configured. The rear lens group LR includes a third lens unit L3 having a fixed positive refractive power and two shift lens units, namely, a fourth lens unit L4 and a fifth lens unit L5 that perform camera shake correction. The fourth lens group (first shift lens group) L4 has a negative refractive power, and the fifth lens group (second shift lens group) L5 has a positive refractive power.

  G1 and G2 are protective glasses made of parallel flat plates.

  SP is an aperture stop, and FP is a flare cut stop.

  IP is an image plane. When the imaging optical system of a video camera or digital still camera is used, the imaging surface of a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor is a silver salt film camera. Corresponds to the film surface.

  The first lens unit L1 and the third lens unit L3 are always fixed with respect to the image plane IP. The second lens unit L2 moves on the optical axis toward the image plane when focusing from an object at infinity to an object at a short distance. The fourth lens group L4 and the fifth lens group L5 are shifted in the direction perpendicular to the optical axis and opposite to each other, thereby generating an image shift on the image plane and correcting the image blur.

  In the lens cross-sectional view of FIG. 5, (A) is the movable fourth and fifth lens groups L4 and L5 for vibration isolation, and (B) is the movable fourth and fifth lens groups L4 and L5. Shows when is eccentric.

  In the lens cross-sectional view (B), the arrows related to the fourth and fifth lens groups L4 and L5 indicate the shift direction during image stabilization.

In the aberration diagram of FIG.
(A) is a longitudinal aberration diagram when the fourth and fifth lens units L4 and L5 are not decentered.
FIG. 6B is a lateral aberration diagram at the image center when the fourth and fifth lens units L4 and L5 are not decentered.
(C) is a lateral aberration diagram at the image center when the fourth and fifth lens units L4 and L5 are decentered.

  The unit of each longitudinal aberration diagram is mm for spherical aberration and field curvature,% for distortion, and mm for lateral chromatic aberration. The unit of the lateral aberration diagram is mm. In the figure, d, F, and C represent aberrations of the wavelength d line, F line, and C line, and M and S represent aberrations of the meridional image surface and the sagittal image surface. Fno is the F number, and ω is the half angle of view.

  In Example 3, it is also possible to shift the image by shifting in the direction perpendicular to the optical axis only with the single fourth lens unit L4. However, in this embodiment, by shifting the two lens groups L4 and L5 in the opposite directions with respect to the optical axis, the amplitude of the shift amount of each lens group is halved with respect to the shift of the single lens group. Yes. Therefore, the size of the lens barrel can be reduced by the reduction amount of the shift amount. In this embodiment, the fourth lens unit L4 and the fifth lens unit L5 are each composed of three lenses including a cemented lens in order to maintain good optical performance when the lens unit is shifted. When the fourth lens unit L4 is shifted alone, the driving load increases. On the other hand, when the two fourth and fifth lens groups L4 and L5 are shifted in the opposite directions, the two movable fourth and fifth lens groups L4 and L5 serve as counterbalance with each other, It will reduce the load.

  The imaging optical system in FIG. 5 has a total angle of view of 6.3 ° and an F number of 1: 2.8.

  The two shift lens groups for image blur correction have positive and negative refractive powers in the first and second embodiments in order from the object side to the image side.

  In contrast, in Example 3, the refractive power is negative and positive.

  In contrast to the configurations of the first and second embodiments, in the third embodiment, the arrangement order of the refractive powers of the lens units shifted in the direction perpendicular to the optical axis is reversed. The arrangement of the refractive power signs may be any, and it is preferable to select the arrangement of the refractive powers depending on the application.

  In the case of the imaging optical system according to the third embodiment, photographing may be performed in a state where the shift lens group is shifted, and it is preferable that there is almost no change in optical performance due to the shift lens group being shifted. On the other hand, in the telescope and binoculars to which the first and second embodiments can be applied, the shift operation of the shift lens group during camera shake correction takes a long time. At the time of the camera shake correction operation, a combined image of whether or not the shift lens group is shifted is observed. More relaxed.

  In contrast to the refractive power arrangement of the movable shift lens group in Examples 1 and 2, the refractive power arrangement of the movable shift lens group in Example 3 has a smaller amount of fluctuation of the image plane tilt due to the shift of the shift lens group. The image plane variation due to the shift of the shift lens group is determined by the refractive power arrangement, and is an aberration that cannot be corrected using a plurality of lenses. Therefore, it is preferable to select a refractive power array as in the third embodiment in the imaging optical system. However, in this arrangement, each lens group is preferably composed of a plurality of lenses in order to correct aberrations other than image plane fluctuation, that is, coma aberration. In order to make the shift lens group for image blur correction compact, it is preferable to use a lens configuration including a cemented lens.

  In each embodiment, it has been shown that by moving the two shift lens groups in the reverse direction perpendicular to the optical axis, the amount of movement of the two shift lens groups is reduced as compared with the case of shifting a single shift lens group. At this time, it is preferable that the shift sensitivities of the two shift lens groups with respect to the image shift have opposite signs and are close in sensitivity. In order to reduce the shift amount of the two shift lens groups, it is preferable that the sensitivity to the image shift is large. Therefore, the shift sensitivities of the first shift lens group and the second shift lens group with respect to the image shift on the image plane of the optical system are Bm1 and Bm2, respectively. At this time, it is more preferable to satisfy the following conditional expression.

−1.6 <Bm1 / Bm2 <−0.6 (1)
| Bm1 |> 1 (2)
| Bm2 |> 1 (3)
Here, the shift sensitivity Bm is a value (value) obtained by dividing the shift amount ΔI of the image on the image plane when the shift lens group is moved in the direction perpendicular to the optical axis by the shift amount ΔL of the shift lens group. Yes,
Bm = ΔI / ΔL
It is.

  In other words, the conditional expression (1) indicates that the refractive powers of the two shift lens groups are preferably opposite in sign and close to each other.

The conditional expression (1) is more preferably
−1.5 <Bm1 / Bm2 <−0.65 (1a)
It is good to do.

  As for the refractive power, when the refractive powers of the first shift lens group and the second shift lens group are Φm1 and Φm2, respectively, it is preferable that the following conditional expressions are satisfied.

−1.6 <Φm1 / Φm2 <−0.5 (4)
The conditional expression (4) is more preferably
−1.5 <Φm1 / Φm2 <−0.6 (4a)
It is good to do.

  In each embodiment, when the two shift lens groups are not shifted in the direction perpendicular to the optical axis, the optical performance when shifted is a practically no problem change as shown in the aberration diagrams. Note that the ray flare angle on the object side due to the shift of the shift lens group is about 0.3 °. At this time, the shift amounts of the shift lens groups of the respective examples are ± 0.23 mm, ± 0.29 mm, and ± 0.69 mm.

  As described above, according to each embodiment, two shift lens groups having different refractive powers adjacent in the optical axis direction are shifted in the direction perpendicular to the optical axis and in the opposite directions. As a result, the shift amount of the shift lens group can be reduced, and the driving load for shifting the shift lens group can be reduced. As a result, in an optical system such as a telescope, binoculars, and a telephoto lens for photographing, it is possible to reduce the power consumption when driving the image blur correction mechanism while reducing the size of the optical system.

  Next, numerical data of numerical examples 1 to 3 corresponding to the first to third examples are shown.

  In each numerical example, where i is the order of the optical surfaces from the object side, Ri is the radius of curvature of the i-th optical surface (i-th surface), and Di is between the i-th surface and the (i + 1) -th surface. , Ndi and νdi respectively indicate the refractive index and Abbe number of the material of the i-th optical member with respect to the d-line.

  In Numerical Examples 1 and 2, shift lenses 1 and 2, an objective lens, an image reversing prism (an erecting prism, since all the prism surfaces are flat surfaces, the radius of curvature is infinite), an eyepiece lens , Eye points (pupils) are shown.

  In Numerical Example 3, a focusing lens, shift lenses 1 and 2, and an image plane are shown.

  Table 1 shows the correspondence with the above-described conditional expressions in each numerical example.

  FIG. 7 is a schematic diagram of a main part of a binocular having a pair of observation optical systems according to the first embodiment. In FIG. 7, L is assigned to the optical system for the left eye, and R is attached to the optical system for the right eye, for the reference numerals of the members shown in FIG.

  In FIG. 7, left and right Polo II prisms PL and PR, which are erecting prisms arranged on the left and right with respect to the left and right objective lenses OBJL and OBJR, and left and right eyepieces OCLL and OCLR are provided. The eye width is adjusted by rotating the eyepieces OCLL and OCLR integrally to the left and right with the optical axes OAL and OAR of the objective lenses OBJL and OBJR as rotation axes.

  When the camera shake correction function is operated, the two shift lens groups for the left and right eyes are shifted by the same amount in the left-right direction and the vertical direction as described above. By providing such a mechanism, still images are always obtained as binoculars.

  The binoculars of FIG. 7 ensure good performance in a wide field of view with an observation magnification of 10 times and an observation field of view of 60 degrees as shown in the longitudinal aberration diagram of FIG.

  In the present embodiment, the present invention is often applied to an observation optical system such as binoculars or a telescope (an optical system that connects intermediate images in the optical system), but the present invention is limited to the observation optical system. It is not something. An imaging optical system that connects a real image of a subject (object) on a photoelectric conversion element, that is, a digital still camera, a video camera, an interchangeable lens that can be attached to a camera body (single-lens reflex camera, etc.), or an optical lens for a mobile phone The present invention may be applied to a device. For example, the anti-vibration optical system of the present embodiment may be arranged in the second group or the third group of the negative, positive, and positive three-group zoom lenses in order from the object (subject) side. Further, it may be arranged in the third group or the fourth group of the positive, negative, positive, positive four-group zoom lens, or the positive, negative, positive, positive (or negative), positive fifth group zoom lens. It may be arranged in the third group or the fourth group, or may be arranged in the fourth group or the fifth group of the negative lead 6-group zoom lens. In addition, the present embodiment can be applied to various optical systems having an imaging optical system and an observation optical system.

Lens sectional view of Example 1 Aberration diagram of Example 1 Lens sectional view of Example 2 Aberration diagram of Example 2 Lens sectional view of Example 3 Aberration diagram of Example 3 The figure which shows the binoculars which used 1 pair of optical systems of Example 1.

Explanation of symbols

L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group L5 5th lens group OBJ, OBJR, OBJL Objective lens P, PR, PL Erecting prism OCL, OCLR, OCLL Eyepiece OAR, OAL Objective lens optical axis IP Pupil position

Claims (7)

An optical system having, in order from the object side, a first shift lens group having a positive refractive power and a second shift lens group having a negative refractive power,
An optical system characterized in that the position of an image formed by the optical system is moved by shifting the first shift lens group and the second shift lens group in directions opposite to each other in a direction perpendicular to the optical axis. An optical system having, in order from the object side, a first shift lens group having a negative refractive power and a second shift lens group having a positive refractive power,
At least one of the first shift lens group and the second shift lens group is composed of a plurality of lenses,
An optical system characterized in that the position of an image formed by the optical system is moved by shifting the first shift lens group and the second shift lens group in directions opposite to each other in a direction perpendicular to the optical axis.   3. The optical system according to claim 1, wherein the first shift lens group and the second shift lens group are disposed adjacent to each other. When the shift sensitivities of the first shift lens group and the second shift lens group are Bm1 and Bm2, respectively.
−1.6 <Bm1 / Bm2 <−0.6
| Bm1 |> 1
| Bm2 |> 1
The optical system according to claim 1, 2 or 3, wherein the following conditional expression is satisfied. When the refractive powers of the first shift lens group and the second shift lens group are Φm1 and Φm2, respectively.
−1.6 <Φm1 / Φm2 <−0.5
The optical system according to claim 1, wherein the following conditional expression is satisfied. An optical apparatus having, in order from the object side, a first shift lens group having a positive refractive power and a second shift lens group having a negative refractive power,
An optical apparatus characterized by moving the position of an image formed by the optical system by shifting the first shift lens group and the second shift lens group in opposite directions in a direction perpendicular to an optical axis. An optical apparatus having, in order from the object side, a first shift lens group having a negative refractive power and a second shift lens group having a positive refractive power,
At least one of the first shift lens group and the second shift lens group is composed of a plurality of lenses,
An optical apparatus characterized by moving the position of an image formed by the optical system by shifting the first shift lens group and the second shift lens group in opposite directions in a direction perpendicular to an optical axis.