JP2005331786A - Optical system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical system having a camera-shake correction function, in which the camera shake correction function is disposed in a finder optical system, thereby the configuration of the optical system is simplified, the load on a drive mechanism is reduced, and degradation due to aberration during the corrections is minimized. <P>SOLUTION: The optical system including a photographing optical system and the finder optical system has an optical path splitting means for splitting an optical path from the photographing optical system to the finder optical system; and the camera shake correcting function is disposed in the finder optical system, after the split of the optical path. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to an optical system. In particular, the present invention relates to an optical system having a function of preventing image blur due to camera shake, for example, vibration when taking a camera by hand, and particularly relates to a finder of a photographing apparatus such as a digital camera, a film camera, and a video camera.

As a conventional example of a finder optical system having a camera shake correction function, there is an optical system described in the following document.
JP-A-9-329820 JP, 2003-91027, A Among these conventional examples, the finder optical system indicated in literature 1 is the composition as shown in FIG.

    In this optical system, an image stabilization lens L is arranged in the optical system. The camera shake correction lens L is decentered by the drive system A in parallel to the optical axis of the finder optical system. In this way, blurring of light that has entered the optical system from the subject is corrected.

    The optical system described in Document 2 has a configuration as shown in FIGS. 19 and 20, a part of the objective lens L is moved in the direction perpendicular to the optical axis. In FIG. 21, the eyepiece lens E is moved in the direction perpendicular to the optical axis. In this way, camera shake correction is performed.

    In the above-described prior art, a lens group having a function of preventing camera shake, that is, a vibration proof group is used. If this anti-vibration group is decentered, the imaging performance deteriorates due to aberrations due to decentering. Further, due to the occurrence of decentration distortion, the image becomes asymmetric with respect to the optical axis. It is necessary to prevent image formation performance degradation and image shape asymmetry due to such image stabilization.

    Further, if the weight of the vibration proof group is large, the burden on the actuator for moving the vibration proof group becomes large. Therefore, it is necessary to lighten the vibration isolation group.

    In addition, when the vibration proof sensitivity is low, the movement amount of the vibration proof group becomes large. On the other hand, if the image stabilization sensitivity is high, it is difficult to control the movement of the image stabilization group. In order to solve this problem, it is necessary to set the image stabilization sensitivity to an appropriate value.

    As described above, the image stabilization optical system needs to consider many points regarding the function for image stabilization.

    None of the optical systems described in Documents 1 and 2 discloses any study on the issues to be considered in the image stabilizing optical system. As described above, these conventional examples have not been studied sufficiently with an optimal vibration isolation method and feasibility. In particular, some of the optical paths in the optical system are not shown.

    In addition, the optical systems described in Documents 1 and 2 are both photographing devices in which the photographing optical system and the finder optical system are separate.

    The optical system of the present invention includes a photographic optical system and a finder optical system, and has optical path dividing means for separating an optical path from the photographic optical system to the finder optical system. The finder optical system has a camera shake correction function (anti-vibration function). Function).

    Since the optical system of the present invention has a camera shake preventing means in the finder optical system, the optical system is simplified. In addition, the observation image in the finder optical system is stabilized. In particular, the optical system of the present invention can eliminate camera shake that becomes a problem when telephoto shooting is performed or a user who is not shooting is shooting.

    The optical system of the present invention is a finder optical system that forms a secondary image by imaging a photographic object twice, and observes the secondary image as a virtual image with an eyepiece lens. It is equipped with.

    In other words, this is an optical system in which a primary image by a photographing optical system is formed as a secondary image by a relay optical system, and this secondary image is observed as a virtual image by an eyepiece lens.

    In this optical system, by setting the magnification of the relay optical system to be greater than 1, the funder magnification can be increased and observation becomes easy. Further, in a camera shake correction optical system (anti-vibration optical system) having a camera shake prevention function, the degree of freedom in layout increases.

    In the optical system of the present invention, it is desirable to shift (move in a plane perpendicular to the optical axis) the lenses constituting the finder optical system in order to prevent camera shake.

    In this way, in order to prevent camera shake, it is possible to prevent camera shake without using an additional optical component for vibration isolation such as a variable apex angle prism. As a result, there are few parts, and the configuration of the optical system can be simplified.

    In the optical system of the present invention, it is preferable to use a finder optical system configured in the order of a primary imaging surface by a photographing optical system, a relay optical system, a secondary imaging surface, an eyepiece, and a virtual image. In this optical system, it is desirable that camera shake is prevented closer to the object side than the secondary imaging surface, and camera shake is prevented on the secondary imaging surface.

    That is, in the present invention, the relay optical system is arranged on the image side from the object image (primary imaging plane) formed by the photographing optical system. An eyepiece lens is arranged on the eye side from the secondary image formed by the relay optical system. Further, this secondary image is observed as a virtual image by an eyepiece lens. In this optical system, as described above, camera shake is prevented in front of the secondary imaging plane.

    In the optical system as described above, when a field frame is provided on the secondary imaging surface, if a camera shake occurs on the observation image on the secondary imaging surface, it is necessary to provide a field frame blur prevention mechanism. On the other hand, when camera shake prevention is performed in front of the secondary imaging surface, it is not necessary to provide blur prevention for the field frame. That is, camera shake of both the observation image and the field frame can be prevented.

    In this case, a camera shake prevention mechanism may be provided between the optical path dividing mirror from the photographic lens and the primary imaging plane.

    In the finder optical system according to the present invention, the primary imaging plane, the relay optical system, the secondary imaging plane, the eyepiece, and the virtual image are arranged in this order. The camera shake may be prevented by decentering the optical element disposed between the two.

    An optical system in which a field frame is arranged on the secondary imaging surface needs a function to prevent the field frame from blurring when camera shake is not corrected on the secondary imaging surface.

    As in the optical system of the present invention, if the lens or lens group in the relay lens system has a camera shake prevention function, camera shake is prevented on the secondary imaging plane. Accordingly, the blur prevention mechanism for the field frame placed on the secondary imaging plane is not necessary.

    In the optical system of the present invention, it is desirable that the relay optical system is composed of the first field lens, the relay lens, and the second field lens from the photographing object side. The relay lens may be composed of a single lens or a plurality of lenses.

    By adopting the configuration as described above in the optical system of the present invention, the field lens can have a function of adjusting the pupil position, and the relay optical system can be miniaturized.

    As described above, when the relay optical system is configured by the first field lens, the relay lens, and the second field lens, and when this relay optical system is used to prevent camera shake, a relay lens (in the case of a plurality of lenses is used). The entire relay lens or a part of the lenses is preferable. The field lens has a large diameter, which increases the burden on the actuator. Further, shifting the field lens for controlling the pupil position is not preferable because the aberration is greatly deteriorated.

    In the present invention, the relay optical system is configured as described above, and the primary imaging plane that is the image position of the imaging optical system is positioned on the object side of the first field lens, and on the eye side of the relay optical system. It is preferable to dispose an eyepiece and to form a virtual image behind it.

    In this optical system, it is desirable that the field lens satisfies the following conditions (1) and (2).

(1) | t1 / f1 |> 2
(2) | t2 / f2 |> 2
Where t1 is the distance from the primary imaging plane to the entrance pupil position, f1 is the focal length of the first field lens, t2 is the distance from the secondary imaging plane to the exit pupil position, and f2 is the focus of the second field lens. Distance.

    By satisfying these conditions (1) and (2), the first and second field lenses have the role of controlling the entrance pupil and exit pupil positions, respectively, thereby reducing the size of the relay optical system. It becomes possible to do.

    Further, in the finder of the present invention, the relay optical system that mainly serves to correct aberrations becomes small, so it becomes easy to provide an aspheric surface and a diffractive surface on each lens (relay lens) constituting the relay optical system. This is effective for downsizing the optical system. If the first and second field lenses are provided with aspheric surfaces, pupil aberration can be effectively corrected.

    In the above configuration, it is desirable that the exit pupil position of the relay optical system be positioned closer to the observer side (opposite the object side) than the secondary imaging plane.

    In the finder optical system, in order to optimize the relay optical system and the eyepiece optical system, when the exit pupil position of the relay optical system is formed closer to the observer than the secondary image plane, the relay optical system and the eyepiece optical system This is preferable because the finder optical system combined with the system can be miniaturized.

    In this case, it is preferable that the following condition (3) is satisfied.

(3) | t1 / f1 |> | t2 / f2 |
In addition, it is desirable that the first and second field lenses satisfy the following conditions (4) and (5), respectively.

(4) s1 / f1 ≧ 0.1
(5) s2 / f2 ≧ 0.1
Here, s1 is a distance from the primary imaging surface to the first field lens, and s2 is a distance from the secondary imaging surface to the second field lens.

    A focusing screen, a field frame, and the like are arranged on the primary imaging surface and the secondary imaging surface in the finder optical system.

    By satisfying the conditions (4) and (5), it is possible to prevent dust attached to the focusing screen or the field frame from being observed.

    In the optical system of the present invention, it is preferable to prevent camera shake by shifting a lens or a lens group having an effective diameter of 70% or less of the maximum effective diameter of the finder optical system in a direction perpendicular to the optical axis.

    Thereby, the burden on the actuator for shifting the lens or lens group for preventing camera shake can be reduced.

    In the viewfinder optical system, it is desirable to shift the optical system including the pupil to prevent camera shake.

    The effective diameter is small near the pupil of the optical system. Therefore, if the lens or lens group located near the real pupil is shifted to prevent camera shake, the burden on the actuator is reduced.

    In the optical system of the present invention, it is desirable that the lens or the lens group (shift group) to be shifted for camera shake correction is a lens group including lenses before and after the real pupil. Thus, it is preferable to use a lens group including lenses before and after the real pupil as a shift group, since aberrations are less deteriorated when shifted to prevent camera shake.

    In particular, it is more effective when the relay optical system is composed of the first field lens, the relay lens, and the second field lens in order from the photographic object side.

    In the optical system of the present invention, it is preferable to prevent camera shake by shifting the eyepiece lens.

    The eyepiece optical system of the observation optical system only needs to have a function of forming a virtual image and has a simple lens configuration. If this eyepiece lens is provided with a camera shake prevention function, there is little deterioration in aberrations, and the weight of the image stabilizing group can be reduced.

    In the optical system of the present invention, it is desirable that the relay lens of the relay optical system includes a positive lens and a negative lens.

    Chromatic aberration can be corrected by configuring the relay lens as described above. Therefore, there is little deterioration of chromatic aberration when the vibration is prevented by the relay lens.

    In this case, it is preferable to include positive, negative, and positive triplet relay lenses in the relay optical system because the aberration can be corrected well with a simple configuration.

    The optical system of the present invention satisfies the following condition (6).

(6) 0.3Δ ≦ T ≦ 3Δ
Here, T is a shift amount for preventing camera shake, and Δ is a shake amount of primary imaging. This condition (6) is for the image stabilization sensitivity to be appropriate. Under this condition (6), if the shift amount T exceeds the upper limit of 3Δ, the sensitivity is too high and it becomes difficult to delicately control the shift amount of the image stabilizing group. On the other hand, if the lower limit of 0.3Δ is not reached, the sensitivity is too low, and the shift amount of the image stabilization becomes large, and the load on the actuator becomes large.

    In the optical system of the present invention, a prism for deflecting the optical path in the finder may be arranged in the relay optical system. In this case, it is desirable to configure the incident surface of the prism as the first field lens. Similarly, the exit surface of the prism may be configured as a second field lens.

    For example, a prism that deflects the optical path is arranged immediately after the primary image, and the surface on the primary image side is a convex surface to serve as the first field lens, or the exit surface is immediately before the secondary image. It is conceivable to arrange a prism for deflecting the optical path and make the exit surface convex to serve as the second field lens, or to provide both prisms.

    In the optical system of the present invention, it is desirable that the magnification β of the relay optical system satisfies the following condition (7).

      (7) 1.1 ≦ β ≦ 2

    The optical system according to the present invention is provided with a camera shake prevention function in the finder optical system, and thus it is possible to perform good camera shake prevention with a simple configuration. In addition, by using an appropriate lens or lens group in the finder optical system as a shift group, it is possible to perform camera shake correction with less burden on the driving mechanism and less aberration deterioration.

    Next, examples of the optical system of the present invention will be shown.

The optical system of Example 1 of the present invention is an optical system having a lens configuration as shown in FIG. 1 and has the following data.

r ₀ = ∞ d ₀ = −0.06
r ₁ = ∞ d ₁ = 3.14
r ₂ = aspheric surface 1 d ₂ = 3.70 n ₁ = 1.4924 ν ₁ = 57.7
r ₃ = -19.66 d ₃ = 10.68
r ₄ = 7.06 d ₄ = 3.75 n ₂ = 1.6968 ν ₂ = 55.5
r ₅ = -16.18 d ₅ = 1.80
r ₆ = -4.11 d ₆ = 0.90 n ₃ = 1.6727 ν ₃ = 32.1
r ₇ = 10.55 d ₇ = 0.75
r ₈ = 27.89 d ₈ = 4.86 n ₄ = 1.6968 ν ₄ = 55.5
r ₉ = -7.33 d ₉ = 11.05
r ₁₀ = aspheric surface 2 d ₁₀ = 4.96 n ₅ = 1.5254 ν ₅ = 55.8
r ₁₁ = -79.46 d ₁₁ = 8.15
r ₁₂ = ∞ d ₁₂ = 25.00
r ₁₃ = aspheric surface 3 d ₁₃ = 3.70 n ₆ = 1.4924 ν ₆ = 57.7
r ₁₄ = -44.85 d ₁₄ = 3.25
r ₁₅ = ∞ d ₁₅ = 1.00 n ₇ = 1.5163 ν ₇ = 64.1
r ₁₆ = ∞ d ₁₆ = 11.09
r ₁₇ = diaphragm surface d ₁₇ = -904.55
r ₁₈ = ∞ d ₁₈ = 0.00

Aspherical surface 1
Curvature radius 10.11
k = 0
A = -6.7217 × 10 ^-4 , B = 4.8326 × 10 ^-6 , C = -3.7491 × 10 ^-8

Aspherical surface 2
Curvature radius 11.84
k = 0
^{A = -1.5339 × 10 -4, B} = 1.5158 × 10 -6, C = -1.3577 × 10 -8

Aspherical surface 3
Curvature radius 17.89
k = 0
A = -3.7860 × 10 ^-5 , B = 5.2082 × 10 ^-7 , C = -5.8476 × 10 ^-9

In the above _{data, r 0, r 1, r} 2, ··· , the radius of curvature of each surface, d _1, d _2, · · · is the surface separation, n _1, n ₂ is the refractive the d-line of each lens The rates, ν ₁ , ν ₂ ,... Are Abbe numbers. Here, r ₀ is the object plane, r ₁ is the primary imaging plane, r ₁₂ is the secondary imaging plane, and the units of length such as ν and d are all mm.

As shown in FIG. 1, the optical system of Example 1 includes a first field lens F1 (r ₂ ) from the imaging position (primary imaging plane) I1 side of the photographing optical system toward the viewer. ˜r ₃ ), a relay lens RL (r ₄ ˜r ₉ ), a relay optical system RLS comprising a second field lens F2 (r ₁₀ ˜r ₁₁ ), and a cemented optical system E (r ₁₃ ˜r ₁₄ ). Has been.

    The optical system according to the first embodiment shifts the lens (shift group) SL of the relay lens RL to prevent camera shake.

In the first embodiment, when the primary image on the primary imaging surface r ₁ is blurred by 0.3 mm, the relay lens (shift group SL) is shifted in a direction perpendicular to the optical axis of 0.27 mm, thereby preventing camera shake. can do.

    In this embodiment, the lens SL to be shifted is a glass lens, but the lens diameter is small, and the burden on the drive mechanism for shifting the lens is not large.

    Further, the lens to be shifted is a lens having only a spherical surface, but it is possible to prevent the deterioration of aberration due to the shift by providing the lens with an aspherical surface.

In the first embodiment, camera shake correction is performed by shifting the relay lens RL, and correction is performed on the object side with respect to the secondary imaging plane I2 (r ₁₂ ).

    Accordingly, camera shake correction is performed at the position of the second field lens F2, and for example, when a field stop is arranged in the vicinity of the second field lens F2, fluctuations in the field stop image due to camera shake are prevented. Since it is not necessary to provide a mechanism separately, it is preferable.

    In the optical system of Example 1, as described above, correction by camera shake is performed by shifting the relay lens. As a result, the aberration states shown in FIGS. 2, 3, 4, 5, and 6 are obtained. It was. On the other hand, there is no camera shake (basic state), and therefore the aberration situation when the axis of the lens SL is an optical axis is as shown in FIG. 12, FIG. 13, FIG. 14, FIG.

    The aberration is a lateral aberration when the maximum image height at the virtual image position is 1.00 and the image heights are -1.00, -0.80, 1.00, 0.80, and 0.00. .

    As can be seen from these aberration diagrams, the optical system of Example 1 corrects the image position by camera shake correction, and maintains almost the same aberration state as the image without camera shake.

    In the optical system of Example 1, values defined by the conditions (1) to (7) are as follows.

t1 / f1 = 14.9
t2 / f2 = 3.59
| T1 / f1 |> | t2 / f2 |
s1 / f1 = 3.2 / 14.1 = 0.23
s2 / f2 = 8.15 / 20 = 0.41
T = 0.27
Δ = 0.3
0.3Δ = 0.09
3Δ = 0.9
β = 1.19
As in the above values, Example 1 satisfies all of the conditions (1) to (7).

In this embodiment, as shown in the data, the object side surface (r ₂ ) of the first field lens F 1, the object side surface (r ₁₀ ) of the second field lens F 2, and the object side of the eyepiece E The surface (r ₁₃ ) is a rotationally symmetric aspherical surface.

    These aspheric surfaces are represented by the following equations.

z = ch ² / [1+ {1− (1 + k) c ² h ² } ^1/2 ]
+ Ah ⁴ + Bh ⁶ + Ch ⁸ + Dh ¹⁰ +...
In the above equation, h is the distance from the optical axis (h ² = x ² + y ² ), c is the curvature of the apex, k is the conic constant, A is the fourth-order aspheric coefficient, B is the sixth-order aspheric coefficient, C is an 8th-order aspheric coefficient, and D is a 10th-order aspheric coefficient.

    The aspheric coefficients and the like in the examples are shown in the data.

    Example 2 is an optical system that performs camera shake correction by shifting the eyepiece lens E at right angles to the optical axis in the same optical system shown in FIG.

In Example 2, when the image on the first imaging plane r ₁ is shaken by 0.3 mm, camera shake can be prevented by shifting the lens E by 0.37 mm.

    In Example 2, since the shifting lens E is a plastic lens, the shifting can be easily performed.

However, at the secondary imaging position r ₁₂ , camera shake correction is not performed and the field stop position is not corrected.

    In the second embodiment, the configuration of the optical system itself is the same as that in the first embodiment. Therefore, the values defined in the conditions (1) to (5) and the condition (7) are the same as those in the first embodiment. . Further, the value of T defined by the condition (6) is 0.37, which satisfies the condition (6).

    The lateral aberration at the virtual image position when the eyepiece is shifted for the camera shake correction of the second embodiment is as shown in FIGS.

    7 is an image height of -1.00, FIG. 8 is an image height of -0.80, FIG. 9 is an image height of 1.00, FIG. 10 is an image height of 0.80, and FIG. 11 is an image height of 0.00. FIG.

    From this aberration diagram, it can be seen that the correction is satisfactorily corrected as is clear from FIGS. 12 to 16 where there is no camera shake.

    FIG. 17 shows an embodiment in which in the optical system of the present invention, the optical path is bent using a prism P, mirrors M1, M2, M3 and the like in the finder optical system. In this embodiment, the incident surface of the prism P is a convex surface to form the first field lens F1.

    As described above, the optical system of the present invention can achieve the object of the present invention in addition to the invention described in the scope of claims.

  (1) In the optical system according to claim 2 or 3, the finder optical system is composed of a relay optical system and an eyepiece in order from the primary imaging surface by the photographing optical system, and the relay optical system. An optical system characterized in that a secondary imaging plane is located between the lens and the eyepiece, and a virtual image is formed on the eye side of the eyepiece.

  (2) The optical system described in the item (1) is characterized in that camera shake is prevented by decentering an optical element disposed between the primary imaging surface and the secondary imaging surface. Optical system.

  (3) The optical system according to claim 2 or 3, wherein the optical system includes a relay optical system, and the relay optical system includes a first field lens, a relay lens, and a second field lens. An optical system characterized by being configured.

  (4) In the optical system described in the item (1), the relay optical system is arranged on the eye side of the primary imaging surface, and the eyepiece lens is arranged on the eye side of the secondary imaging surface by the relay optical system. An optical system in which a virtual image by an eyepiece is formed on the eye side.

  (5) An optical system according to the item (3) or (4), wherein the following conditions (1) and (2) are satisfied.

(1) | t1 / f1 |> 2
(2) | t2 / f2 |> 2
Where t1 is the distance from the primary imaging plane to the entrance pupil position, f1 is the focal length of the first field lens, t2 is the distance from the secondary imaging plane to the exit pupil position, and f2 is the focus of the second field lens. Distance.

  (6) The optical system according to claim 2 or 3, wherein the finder optical system includes a relay optical system, and an exit pupil of the relay optical system is formed on the eye side with respect to the second imaging plane. An optical system characterized by being configured as described above.

  (7) In the optical system according to claim 3, the finder optical system includes a first field lens, a relay optical system, and a second field lens, and the following conditions (4), ( An optical system satisfying 5).

(4) s1 / f1 ≧ 0.1
(5) s2 / f2 ≧ 0.1
Here, s1 is a distance from the primary imaging surface to the first field lens, and s2 is a distance from the secondary imaging surface to the second field lens.

  (8) In the optical system according to claim 1, the lens or the lens group constituting the finder optical system, wherein the lens or the lens group has a diameter of 70% or less of the maximum effective diameter of the finder optical system. An optical system characterized in that camera shake correction is performed by shifting.

  (9) An optical system according to claim 1, wherein a camera shake is corrected by shifting a lens or a lens group including a pupil.

  (10) The optical system according to claim 1, wherein the lens group that is shifted to correct camera shake includes lenses before and after the real pupil.

  (11) An optical system according to claim 3, wherein the finder optical system includes an eyepiece lens, and the camera shake is corrected by shifting the eyepiece lens.

  (12) An optical system according to claim 2 or 3, wherein the finder optical system includes a relay optical system, and the relay optical system includes a positive lens and a negative lens.

  (13) The optical system according to claim 2 or 3, wherein the lens or the lens group that is shifted to correct camera shake satisfies the following condition (6).

(6) 0.3Δ ≦ T ≦ 3Δ
However, T is a shift amount for preventing camera shake, and Δ is a shake amount of primary imaging. (14) In the optical system described in the above (3) or (4), an optical path deflecting prism is disposed in the field optical system, and an incident surface or an exit surface of the optical path deflecting prism is the first field lens or the second optical system. An optical system comprising a field lens.

  (15) The optical system according to claim 2 or 3, wherein the finder optical system includes a relay optical system, and the magnification β of the relay optical system satisfies the following condition (7): An optical system.

      (7) 1.1 ≦ β ≦ 2

    The optical system of the present invention can be used in a photographing apparatus such as a digital camera, a film camera, a video camera, and the like, and thereby, an observation image by a finder can be observed without shaking.

The figure which shows the structure of the finder optical system of this invention Aberration diagram at image height -1.00 of Example 1 of the present invention Aberration diagram at image height -0.80 in Example 1 of the present invention. Aberration diagram at image height 1.00 of Example 1 of the present invention Aberration diagram at image height 0.80 of Example 1 of the present invention Aberration diagram at image height 0.00 of Example 1 of the present invention Aberration diagram at image height -1.00 in Example 2 of the present invention. Aberration diagram at image height -0.80 in Example 2 of the present invention. Aberration diagram of Example 2 of the present invention at an image height of 1.00 Aberration diagram of Example 2 of the present invention at an image height of 0.80 Aberration diagram at image height 0.00 of Example 2 of the present invention Lateral aberration diagram of the reference optical system of the present invention (when there is no camera shake) at an image height of -1.00 Lateral aberration diagram of the reference optical system of the present invention (when there is no camera shake) at an image height of −0.80 Transverse aberration diagram at the image height of 1.00 of the reference optical system (when there is no camera shake) of the optical system of the present invention Transverse aberration diagram at the image height of 0.80 of the reference optical system (when there is no camera shake) 2 of the optical system of the present invention Transverse aberration diagram at an image height of 0.00 of the reference optical system (when there is no camera shake) of the optical system of the present invention Schematic of the Example which has arrange | positioned the optical path deflection prism to the finder optical system by the optical system of this invention The figure which shows the structure of the optical system which provided the conventional camera shake prevention function The figure which shows the structure of the optical system which provided the other conventional camera-shake prevention function The figure which shows the structure of the optical system which provided the other conventional camera-shake prevention function The figure which shows the structure of the optical system which provided the other conventional camera-shake prevention function

Claims (3)

An optical system comprising a photographic optical system and a finder optical system, wherein the photographic optical system has optical path dividing means for dividing an optical path into the finder optical system, and the finder optical system has camera shake preventing means . The optical system according to claim 1, wherein a secondary image formed by imaging a photographic object twice is observed with an eyepiece provided in the finder optical system. 3. The optical system according to claim 1, wherein the camera shake prevention function is to prevent camera shake by shifting a lens constituting the funder optical system.

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