JP5288238B2 - Magnifying optical system, optical apparatus equipped with the magnifying optical system, and magnifying method of the magnifying optical system - Google Patents

Magnifying optical system, optical apparatus equipped with the magnifying optical system, and magnifying method of the magnifying optical system Download PDF

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JP5288238B2
JP5288238B2 JP2007331499A JP2007331499A JP5288238B2 JP 5288238 B2 JP5288238 B2 JP 5288238B2 JP 2007331499 A JP2007331499 A JP 2007331499A JP 2007331499 A JP2007331499 A JP 2007331499A JP 5288238 B2 JP5288238 B2 JP 5288238B2
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refractive power
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JP2009156893A (en
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智希 伊藤
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株式会社ニコン
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Description

  The present invention relates to a variable magnification optical system, an optical apparatus including the variable magnification optical system, and a variable magnification method for the variable magnification optical system.

Conventionally, a variable magnification optical system suitable for a photographic camera, an electronic still camera, a video camera, and the like has been proposed (see, for example, Patent Document 1).
JP 2006-201524 A

  However, the conventional variable magnification optical system has a problem that it cannot achieve good optical performance, for example, aberrations during camera shake correction are not sufficiently corrected.

  The present invention has been made in view of such problems, and a variable power optical system having good optical performance even during camera shake correction, an optical apparatus including the variable power optical system, and a variable power optical system An object of the present invention is to provide a scaling method.

In order to solve the above problems, a variable magnification optical system according to a first aspect of the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, The lens unit includes substantially four lens groups, a third lens group having a positive refractive power and a fourth lens group having a positive refractive power . The fourth lens group has a positive refractive power in order from the object side. A 4a partial lens group having a negative refractive power, a 4b partial lens group having a negative refractive power, the 4a partial lens group having a negative meniscus lens having a convex surface facing the object side, and a 4b partial lens There line camera shake correction by moving the group in the direction perpendicular to the optical axis, the third lens unit performs focusing from infinity to a close object, a lens position state from the wide-angle end state to the telephoto end state When changing, the distance between the first lens group and the second lens group increases and the second lens group increases. Decreasing the distance between's group and the third lens group, configured such that the distance between the third lens group and the fourth lens group is changed.
In the zoom optical system according to the first aspect of the present invention, it is preferable that the 4b partial lens group is composed of a single cemented lens.

The variable magnification optical system according to the second aspect of the present invention has, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power. The fourth lens group substantially includes four lens groups, that is, a third lens group and a fourth lens group having a positive refractive power. The fourth lens group is a fourth lens having a positive refractive power in order from the object side. And a 4b partial lens group having negative refractive power, the 4a partial lens group has a negative meniscus lens having a convex surface facing the object side, and the 4b partial lens group is orthogonal to the optical axis. When the lens position is changed from the wide-angle end state to the telephoto end state, the 4b partial lens group is composed of a single cemented lens. The distance between the second lens group and the second lens group is increased. Interval is reduced, and as the distance between the third lens group and the fourth lens group is changed.

  In such a variable magnification optical system, it is preferable that the fourth lens group further includes a fourth c partial lens group having a positive refractive power on the image plane side than the fourth b partial lens group.

Further, in such a variable magnification optical system, when the focal length of the first lens group is f1 and the focal length of the third lens group is f3, the following expression 0.8 <f1 / f3 <1.3
It is preferable to satisfy the following conditions.

Also, in such a variable magnification optical system, when the focal length of the third lens group is f3 and the focal length of the fourth lens group is f4, the following formula 0.5 <f3 / f4 <1.2
It is preferable to satisfy the following conditions.

  In such a variable magnification optical system, it is preferable that an aperture stop be disposed between the third lens group and the fourth lens group.

  Also, in such a variable magnification optical system, when the lens position changes from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group It is preferable that the distance between the three lens groups is reduced.

  In such a variable magnification optical system, it is preferable that the first lens group is fixed when the lens position changes from the wide-angle end state to the telephoto end state.

  In such a variable magnification optical system, it is preferable that the fourth lens group is fixed when the lens position changes from the wide-angle end state to the telephoto end state.

  An optical apparatus according to the present invention includes any of the above-described variable magnification optical systems.

The zooming method of the zooming optical system according to the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power. A third lens group,
The fourth lens group is composed of substantially four lens groups with a fourth lens group having a positive refractive power, and the fourth lens group, in order from the object side, has a 4a partial lens group having a positive refractive power and a negative refraction. 4b partial lens group having power, the 4a partial lens group has a negative meniscus lens having a convex surface facing the object side, and the fourth b partial lens group is moved in a direction orthogonal to the optical axis. there line camera shake correction, the third lens group, a focusing from infinity object to a close object to a scaling process line cormorants variable power optical system, the lens position state from the wide-angle end state to the telephoto end state When changing, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, and the distance between the third lens group and the fourth lens group increases. Configured to change .

  By configuring the variable power optical system according to the present invention, the optical apparatus equipped with the variable power optical system, and the variable power method of the variable power optical system as described above, good optical performance can be obtained even during camera shake correction. it can.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the variable magnification optical system ZL includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a positive refractive power. And a fourth lens group G4 having a positive refractive power. The variable magnification optical system ZL shown in FIG. 1 corresponds to a first example which will be described later.

  In such a variable magnification optical system ZL, the fourth lens group G4 includes, in order from the object side, a fourth a partial lens group G4a having a positive refractive power and a fourth b partial lens group G4b having a negative refractive power. It is configured. Here, the 4a partial lens group G4a desirably includes a negative meniscus lens having a convex surface directed toward the object side (for example, the negative meniscus lens L41 in FIG. 1). Thereby, axial chromatic aberration can be corrected effectively. The 4b partial lens group G4b has a smallest lens diameter compared to other lens groups or other partial lens groups, and is therefore suitable for incorporating a camera shake correction mechanism. Therefore, as shown by an arrow in the upper part of FIG. 1, the camera shake correction is performed by moving the 4b partial lens group G4b in a direction orthogonal to the optical axis. With this configuration, it is possible to satisfactorily correct aberration fluctuations associated with downsizing of the lens barrel and camera shake correction.

  The fourth lens group G4 preferably includes a fourth c partial lens group G4c having positive refractive power on the image plane side from the fourth b partial lens group G4b.

  The third lens group G3 preferably performs focusing from a long distance object to a short distance object. Further, the third lens group G3 is suitable for performing focusing because the number of lenses is smaller than that of the other lens groups. With this configuration, there is no change in the overall length due to focusing, and good optical performance can be obtained even when shooting a short distance object.

  Further, in the zoom optical system ZL, when the lens position changes from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens G2 increases, and the second lens It is desirable that the distance between the group G2 and the third lens group G3 is reduced. Thereby, the image plane position can be kept constant while ensuring a sufficient zoom ratio.

  In the zoom optical system ZL, it is desirable that the first lens group G1 is fixed when the lens position changes from the wide-angle end state to the telephoto end state. This is advantageous for simplifying the zoom mechanism. In the zoom optical system ZL, it is desirable that the fourth lens group G4 is fixed when the lens position changes from the wide-angle end state to the telephoto end state. This is advantageous for simplifying the zoom mechanism. Further, when the lens position state changes from the wide-angle end state to the telephoto end state, if the first lens group G1 and the fourth lens group G4 are fixed, the total length of the variable magnification optical system ZL can be kept constant. .

  Now, conditions for constructing such a variable magnification optical system ZL will be described. First, it is desirable that the variable magnification optical system ZL satisfies the following conditional expression (1) when the focal length of the first lens group G1 is f1 and the focal length of the third lens group G3 is f3. .

0.8 <f1 / f3 <1.3 (1)

  Conditional expression (1) defines the focal length of the first lens group G1 with respect to the focal length of the third lens group G3. This variable magnification optical system ZL can achieve miniaturization of the variable magnification optical system by satisfying this conditional expression (1). Also, good optical performance can be realized even when shooting a short-distance object. That is, fluctuations in aberration can be reduced even when focusing on an object at a short distance as well as at infinity. If the upper limit value of the conditional expression (1) is exceeded, the refractive power of the first lens group G1 becomes weak, and the total length of the variable magnification optical system ZL becomes large. Or, since the refractive power of the third lens group G3 becomes strong, it becomes difficult to suppress the variation of spherical aberration and curvature of field at the time of focusing, which is not preferable. On the other hand, if the lower limit of conditional expression (1) is not reached, the refractive power of the first lens group G1 becomes strong, and it becomes difficult to correct spherical aberration, axial chromatic aberration, and lateral chromatic aberration at the telephoto end. In addition, the effect of this invention can be made more reliable by making the upper limit of conditional expression (1) 1.2 and a lower limit into 0.9.

  In addition, it is desirable that the zoom optical system ZL satisfies the following conditional expression (2) when the focal length of the third lens group G3 is f3 and the focal length of the fourth lens group G4 is f4. .

0.5 <f3 / f4 <1.2 (2)

  Conditional expression (2) defines the focal length of the third lens group G3 with respect to the focal length of the fourth lens group G4. The zooming optical system ZL satisfies this conditional expression (2), and can realize good optical performance even when shooting a short-distance object. If the upper limit value of conditional expression (2) is exceeded, the refractive power of the fourth lens group G4 becomes strong, and it becomes difficult to correct spherical aberration at the telephoto end. Furthermore, correction of field curvature and astigmatism becomes difficult, which is not preferable. On the other hand, if the lower limit of conditional expression (2) is not reached, the refractive power of the third lens group G3 becomes strong, and it becomes difficult to suppress fluctuations in spherical aberration and field curvature during focusing. Absent. In addition, the effect of this invention can be made more reliable by making the upper limit of conditional expression (2) into 1.0 and making a lower limit into 0.6.

  In this variable magnification optical system ZL, the 4a partial lens group G4a constituting the fourth lens group G4 is a negative meniscus lens having a convex surface directed toward the object side in order from the object side (negative meniscus lens L41 in FIG. 1). And a positive lens (positive meniscus lens L42 in FIG. 1). The negative meniscus lens and the positive lens may be a cemented lens, or may be independent lens components with an air interval interposed therebetween. In addition, it is desirable that the radius of curvature of the image side lens surface of the negative meniscus lens and the radius of curvature of the object side lens surface of the positive lens are smaller than those of other lens surfaces included in the 4a partial lens group G4a. .

  In this variable magnification optical system ZL, it is preferable that the 4b partial lens group G4b constituting the fourth lens group G4 is composed of one cemented lens. With this configuration, it is possible to reduce the weight of the camera shake correction lens, and it is possible to reduce the size of the entire camera barrel of the camera shake correction mechanism and the variable magnification optical system. In addition, it is desirable that the fourth-b partial lens group G4b is composed of a cemented lens in which a positive lens and a negative lens are bonded in order from the object side. Further, the positive lens included in the 4b partial lens group G4b is preferably a positive meniscus lens having a convex surface facing the image side (for example, the positive meniscus lens L43 in FIG. 1), and the negative lens included in the 4b partial lens group G4b. The lens preferably has a biconcave shape (for example, a biconcave lens L44 in FIG. 1).

  In the zoom optical system ZL, it is preferable that the fourth c partial lens group G4c constituting the fourth lens group G4 has at least three lens components. The fourth c partial lens group G4c includes, in order from the object side, two positive lens components (for example, a cemented lens of a negative meniscus lens L45 and a biconvex lens L46 and a biconvex lens L47 in FIG. 1), and one negative lens. It is desirable to have a lens component (for example, the negative meniscus lens L48 in FIG. 1). It is desirable to interpose an air gap between the lens components constituting the 4c partial lens group G4c, and the second positive lens component counted from the object side rather than the air gap between the two positive lens components. It is desirable that the air gap between the negative lens component and the negative lens component is larger. The first positive lens component counted from the object side is preferably a cemented lens of a negative lens and a positive lens.

  16 and 17 show a configuration of an electronic still camera 1 (hereinafter simply referred to as a camera) as an optical apparatus including the above-described variable magnification optical system ZL. In the camera 1, when a power button (not shown) is pressed, a shutter (not shown) of the photographing lens (variable magnification optical system ZL) is opened, and light from a subject (not shown) is condensed by the variable magnification optical system ZL. The image is formed on an image sensor C (for example, a CCD or a CMOS) disposed on the surface I. The subject image formed on the image sensor C is displayed on the liquid crystal monitor 2 disposed behind the camera 1. The photographer determines the composition of the subject image while looking at the liquid crystal monitor 2, and then presses the release button 3 to photograph the subject image with the image sensor C and records and saves it in a memory (not shown).

  The camera 1 includes an auxiliary light emitting unit 4 that emits auxiliary light when the subject is dark, and a wide (W) when zooming the zoom optical system ZL from the wide-angle end state (W) to the telephoto end state (T). A tele (T) button 5 and function buttons 6 used for setting various conditions of the camera 1 are arranged. The camera 1 may be a so-called single-lens reflex camera including a half mirror, a focusing screen, a pentaprism, an eyepiece optical system, and the like. The variable magnification optical system ZL may be provided in an interchangeable lens that can be attached to and detached from a single-lens reflex camera.

  The contents described below can be appropriately adopted as long as the optical performance is not impaired.

  First, the variable magnification optical system ZL having a four-group configuration has been described in the above description and the following examples. However, the above-described configuration conditions and the like can be applied to other group configurations such as the fifth group and the sixth group. is there. For example, in this embodiment, the lens system is composed of four movable groups. However, other lens groups are added between the lens groups, or adjacent to the image side or object side of the lens system. It is also possible to add these lens groups. The fourth lens group G4 of the variable magnification optical system ZL includes a 4a partial lens group G4a and a 4b partial lens group G4b, and the fourth c partial lens group G4c is arranged along the optical axis direction at the time of zooming. It may be a fifth lens group that moves.

  In the above description, the case where the third lens group G3 is used for focusing has been described. However, the present invention is not limited to the third lens group G3, and a single lens group, a plurality of lens groups, or a partial lens group is arranged in the optical axis direction. The focusing lens group may be moved to focus from an object at infinity to an object at a short distance. In this case, the focusing lens group can be applied to autofocus, and is also suitable for driving a motor for autofocus (such as an ultrasonic motor). In particular, it is preferable that the third lens group G3 is a focusing lens group as described above. Note that the first lens group G1 and the second lens group G2 can be used as a focusing lens group.

  In the present invention, in order to prevent a photographing failure due to an image blur caused by a camera shake or the like which is likely to occur in a high variable magnification variable magnification optical system, a blur detection system for detecting a blur of the lens system and a driving unit are provided. The image blur caused by the blur of the lens system detected by the blur detection system is obtained by decentering all or part of one of the lens groups constituting the lens system as an anti-vibration lens group. The image blur can be corrected by driving the image stabilizing lens group by the driving means and shifting the image so as to correct the fluctuation of the image plane position. In particular, it is preferable that the 4b partial lens group G4b is an anti-vibration lens group as described above. Thus, the variable magnification optical system ZL according to the present embodiment can function as a so-called vibration-proof optical system.

  In the zoom optical system ZL, the lens surface may be an aspherical surface. At this time, any one of an aspheric surface by grinding, a glass mold aspheric surface in which glass is formed into an aspheric shape by a mold, and a composite aspheric surface in which resin is formed in an aspheric shape on the surface of the glass may be used. It should be noted that all the lens surfaces constituting the variable magnification optical system ZL may be configured by a combination of a spherical surface and a flat surface. Thus, the variable magnification optical system ZL can be configured without using an aspheric lens, which is preferable from the viewpoint of manufacturing tolerances.

  The aperture stop S is preferably disposed in the vicinity of the fourth lens group G4. However, the role of the aperture stop may be substituted by a lens frame without providing a member as an aperture stop. Note that the position of the aperture stop S may be in front of, in the middle, or behind the fourth lens group G4. Further, the aperture stop S can be disposed on the most object side of the fourth lens group G4 and can be fixed at the time of zooming.

  Furthermore, an antireflection film having a high transmittance in a wide wavelength range is applied to each lens surface, thereby reducing flare and ghost and achieving high contrast and high optical performance.

  In addition, in order to explain the present invention in an easy-to-understand manner, the configuration requirements of the embodiment have been described, but it goes without saying that the present invention is not limited to this.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the movement of each lens group in the refractive power distribution of the zoom optical system ZL and the change in the focal length state from the wide-angle end state (W) to the telephoto end state (T). As shown in FIG. 1, the variable magnification optical system ZL according to the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. The third lens group G3 having a positive refractive power and the fourth lens group G4 having a positive refractive power. The fourth lens group G4 includes, in order from the object side, a 4a partial lens group G4a having a positive refractive power, a 4b partial lens group G4b having a negative refractive power, and a fourth c having a positive refractive power. And a partial lens group G4c. Then, when zooming from the wide-angle end state to the telephoto end state, the second lens group G2 and the third lens group G3 are shown in FIG. 1 with the first lens group G1 and the fourth lens group G4 fixed. , The air gap between the first lens group G1 and the second lens group G2 increases, the air gap between the second lens group G2 and the third lens group G3 decreases, and the third lens group G1 is moved along the optical axis. The distance between the lens groups is changed so that the air distance between the lens group G3 and the fourth lens group G4 changes. Further, as shown in FIG. 1, the third lens group G3 is moved in the image side direction along the optical axis to perform focusing from a long distance object to a short distance object, and further, the 4b partial lens group G4b. Is moved in the direction orthogonal to the optical axis to perform camera shake correction (anti-vibration).

[First embodiment]
FIG. 1 is a diagram showing a configuration of a variable magnification optical system ZL1 according to the first example of the present invention. In the variable magnification optical system ZL1 of FIG. 1, the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a positive meniscus lens L12 having a convex surface facing the object side. The positive meniscus lens L13 has a convex surface facing the object side, and the positive meniscus lens L14 has a convex surface facing the object side. The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, a cemented lens of a biconcave lens L22 and a positive meniscus lens L23 having a convex surface facing the object side, and a concave surface facing the object side The negative meniscus lens L24 facing The third lens group G3 includes, in order from the object side, a positive meniscus lens L31 having a concave surface facing the object side, and a cemented lens of a biconvex lens L32 and a negative meniscus lens L33 having a concave surface facing the object side. The fourth lens group G4 includes, in order from the object side, a fourth a partial lens group G4a, a fourth b partial lens group G4b, and a fourth c partial lens group G4c. The fourth a partial lens group G4a is arranged from the object side. In order, it is composed of a cemented lens of a negative meniscus lens L41 having a convex surface facing the object side and a positive meniscus lens L42 having a convex surface facing the object side, and the 4b partial lens group G4b has a concave surface facing the object side in order from the object side. The fourth c partial lens group G4c is composed of a negative meniscus lens L45 having a convex surface facing the object side and a biconvex lens L46 in order from the object side. The lens includes a lens, a biconvex lens L47, and a negative meniscus lens L48 having a concave surface facing the object side. The aperture stop S is located closest to the object side of the fourth lens group G4.

  Note that the rotational shake at an angle θ is corrected with a lens having a focal length f of the entire system and an image stabilization coefficient (ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) K. In this case, the moving lens group for shake correction may be moved in the direction orthogonal to the optical axis by (f · tan θ) / K (this relationship is the same in the following embodiments). In the wide-angle end state of the first embodiment, the image stabilization coefficient is 0.80 and the focal length is 71.4 (mm). Therefore, the 4b partial lens for correcting the rotation blur of 0.40 °. The movement amount of the group G4b is 0.62 (mm). In the telephoto end state of the first embodiment, since the image stabilization coefficient is 0.80 and the focal length is 196.0 (mm), the fourth b for correcting the rotation blur of 0.20 °. The moving amount of the partial lens group G4b is 0.86 (mm).

  Table 1 below lists values of specifications of the first embodiment. In Table 1, f represents the focal length, FNO represents the F number, and 2ω represents the angle of view. Furthermore, the surface number is the order of the lens surfaces from the object side along the direction of travel of the light beam, the surface interval is the distance on the optical axis from each optical surface to the next optical surface, and the refractive index and Abbe number are each The value for the d-line (λ = 587.6 nm) is shown. Incidentally, the thirty-fourth surface shows the image plane I of the variable magnification optical system ZL1 as shown in FIG. Here, “mm” is generally used for the focal length f, the radius of curvature, the surface interval, and other length units listed in all the following specifications, but the optical system is proportionally enlarged or reduced. However, since the same optical performance can be obtained, it is not limited to this. The radius of curvature of 0.0000 indicates a plane, and the refractive index of air of 1.0000 is omitted. The description of these symbols and the description of the specification table are the same in the following examples.

(Table 1)
Zoom ratio 2.745
Wide angle end Intermediate focal length Telephoto end
f = 71.40 to 135.00 to 196.00
F.NO = 2.90 to 2.90 to 2.90
2ω = 34.18-17.78-12.20
Image height = 21.60 to 21.60 to 21.60

Surface number Curvature radius Surface spacing Abbe number Refractive index
0 (object surface) (d0)
1 134.3991 2.000 32.35 1.850 260
2 69.5163 10.000 82.52 1.497820
3 1018.5520 0.100
4 78.6963 8.000 82.52 1.497820
5 724.9624 0.100
6 99.2266 6.000 65.46 1.603001
7 578.6701 (d1)
8 265.5800 1.800 37.16 1.834000
9 33.0667 9.019
10 -67.3753 1.800 82.52 1.497820
11 40.5532 6.000 23.78 1.846660
12 1668.2091 4.293
13 -48.6403 1.800 63.37 1.618000
14 -792.4848 (d2)
15 -14921.701 4.000 46.80 1.766840
16 -88.3869 0.100
17 102.6474 8.000 82.52 1.497820
18 -61.2775 2.000 32.35 1.850 260
19 -200.0915 (d3)
20 (Aperture) 1.000
21 60.0000 2.000 32.35 1.850 260
22 45.3031 8.000 82.52 1.497820
23 1316.1848 35.000
24 -149.1501 4.000 37.16 1.834000
25 -45.8221 1.500 65.46 1.603001
26 65.4819 5.000
27 124.1362 2.000 32.35 1.850 260
28 50.9390 7.000 82.52 1.497820
29 -97.6523 0.100
30 46.6990 7.000 82.52 1.497820
31 -298.0953 16.171
32 -58.0666 2.000 55.52 1.696797
33 -127.9529 (Bf)
34 (image plane)

[Zoom lens group data]
Lens group Focal length 1st lens group 89.295
Second lens group -26.730
Third lens group 83.047
Fourth lens group 119.019
4a partial lens group 162.568
4b partial lens group -101.893
4c partial lens group 77.597

  In the first embodiment, the axial air distance d1 between the first lens group G1 and the second lens group G2, the axial air distance d2 between the second lens group G2 and the third lens group G3, and the third lens group G3. The on-axis air gap d3 between the first lens group G4 and the fourth lens group G4 and the back focus Bf change during zooming. Table 2 below shows the variable interval data and the total length at each focal length in the wide-angle end state, the intermediate focal length state, and the telephoto end state. In Table 2, f represents the focal length, and the description of this reference is the same in the following embodiments.

(Table 2)
[Variable interval data]
Wide angle end Intermediate focal length Telephoto end
f 71.400 135.000 196.000
d1 2.000 23.456 30.877
d2 29.477 15.391 2.000
d3 18.951 11.581 17.551
Bf 52.969 52.969 52.969
Total length 259.180 259.180 259.180

  Table 3 below shows variable distance data at the time of short-distance focusing at each focal length in the wide angle end state, the intermediate focal length state, and the telephoto end state. In Table 3, β is a magnification, d0 is an axial air space between the object and the first lens group G1, d1 is an axial air space between the first lens group G1 and the second lens group G2, and d2 is a second lens. The axial air gap between the group G2 and the third lens group G3, d3 represents the axial air gap between the third lens group G3 and the fourth lens group G4, and Bf represents the back focus. The description of these symbols is the same in the following embodiments.

(Table 3)
[Variable interval data at close focus]
Wide angle end Intermediate focal length Telephoto end β -0.040 -0.070 -0.090
d0 1689.317 1673.075 1769.033
d1 2.000 23.456 30.877
d2 31.026 20.552 11.609
d3 17.401 6.419 7.941
Bf 52.969 52.969 52.969

  Table 4 below shows focusing movement amount data at each focal length in the wide-angle end state, the intermediate focal length state, and the telephoto end state. In Table 4, δ3 is a movement amount when focusing on the object at d0, and the on-axis air distance d2 between the second lens group G2 and the third lens group G3 increases by this movement amount δ3. The axial air gap d3 between the third lens group G3 and the fourth lens group G4 decreases. The description of these symbols is the same in the following embodiments.

(Table 4)
[Focusing distance data]
Wide angle end Intermediate focal length Telephoto end
f 71.400 135.000 196.000
δ3 1.550 5.162 9.609

  Table 5 below shows values corresponding to the conditional expressions in the first embodiment. In Table 5, f1 represents the focal length of the first lens group G1, f3 represents the focal length of the third lens group G3, and f4 represents the focal length of the fourth lens group G4. The description of this symbol is the same in the following embodiments. Thus, in the first embodiment, all the conditional expressions (1) and (2) are satisfied.

(Table 5)
(1) f1 / f3 = 1.08
(2) f3 / f4 = 0.70

  FIG. 2A shows an aberration diagram in the infinite focus state in the wide-angle end state of the first embodiment, FIG. 3 shows an aberration diagram in the infinite focus state in the intermediate focal length state, and FIG. FIG. 4A is an aberration diagram in the infinitely focused state, FIG. 5A is an aberration diagram in the near-field object focused state at the wide-angle end state, and FIG. FIG. 5B shows an aberration diagram in the state, and FIG. 5C shows an aberration diagram in the near-distance object focusing state in the telephoto end state. Further, FIG. 2B shows a meridional lateral aberration diagram when the blur correction is performed with respect to the rotational blur of 0.40 ° in the infinity photographing state at the wide-angle end state of the first example, and FIG. FIG. 4B shows a meridional lateral aberration diagram when blur correction is performed for 0.20 ° rotational blur in the infinity shooting state at the telephoto end state.

  In each aberration diagram, FNO represents an F number, Y represents an image height, d represents a d-line (λ = 587.6 nm), and g represents a g-line (λ = 435.6 nm). In the aberration diagrams showing astigmatism, the solid line shows the sagittal image plane, and the broken line shows the meridional image plane. The description of this aberration diagram is the same in the following examples. As is apparent from the respective aberration diagrams, in the first embodiment, it is understood that various aberrations are well corrected in each focal length state from the wide-angle end state to the telephoto end state, and excellent imaging performance is obtained.

[Second Embodiment]
FIG. 6 is a diagram showing a configuration of the variable magnification optical system ZL2 according to the second example of the present invention. In the variable magnification optical system ZL2 of FIG. 6, the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a positive meniscus lens L12 having a convex surface facing the object side. , A biconvex lens L13, and a positive meniscus lens L14 having a convex surface facing the object side. The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, a cemented lens of a biconcave lens L22 and a positive meniscus lens L23 having a convex surface facing the object side, and a concave surface facing the object side The negative meniscus lens L24 facing The third lens group G3 includes, in order from the object side, a positive meniscus lens L31 having a concave surface facing the object side, and a cemented lens of a biconvex lens L32 and a negative meniscus lens L33 having a concave surface facing the object side. The fourth lens group G4 includes, in order from the object side, a 4a partial lens group G4a, a 4b partial lens group G4b, and a 4c partial lens group G4c. The 4a partial lens group G4a is disposed on the object side. Consists of a cemented lens of a negative meniscus lens L41 having a convex surface and a positive meniscus lens L42 having a convex surface facing the object side, and the fourth lens group G4b has a negative meniscus having a concave surface facing the object side in order from the object side. The fourth c partial lens group G4c is composed of a cemented lens of a lens L43 and a biconcave lens L44, and is composed of a negative meniscus lens L45 having a convex surface facing the object side and a biconvex lens L46 in order from the object side, and a biconvex lens L47. And a negative meniscus lens L48 having a concave surface facing the object side. The aperture stop S is located closest to the object side of the fourth lens group G4.

  In the wide-angle end state of the second embodiment, the image stabilization coefficient is 1.00 and the focal length is 71.4 (mm). Therefore, the second correction for correcting the rotation blur of 0.40 ° is performed. The moving amount of the 4b partial lens group G4b is 0.50 (mm). Further, in the telephoto end state of the second embodiment, the image stabilization coefficient is 1.00 and the focal length is 196.0 (mm), so that the first for correcting the rotational blur of 0.20 °. The moving amount of the 4b partial lens group G4b is 0.68 (mm).

  Table 6 below lists values of specifications of the second embodiment. In Table 6, the 34th surface shows the image surface I of the variable magnification optical system ZL2 as shown in FIG.

(Table 6)
Zoom ratio 2.745
Wide angle end Intermediate focal length Telephoto end
f = 71.40 to 135.00 to 196.00
F.NO = 2.90 to 2.90 to 2.90
2ω = 34.12-17.76-12.21
Image height = 21.60 to 21.60 to 21.60

Surface number Curvature radius Surface spacing Abbe number Refractive index
0 (object surface) (d0)
1 213.2625 2.000 32.35 1.850 260
2 83.9093 10.000 82.52 1.497820
3 1658.5174 0.100
4 104.1537 8.500 82.52 1.497820
5 -20142.024 0.100
6 84.2773 7.500 65.46 1.603001
7 817.7984 (d1)
8 313.9238 2.200 42.72 1.834807
9 33.5757 7.661
10 -75.7612 2.000 70.41 1.487490
11 40.6855 6.000 23.78 1.846660
12 390.5792 4.407
13 -46.5395 2.200 58.22 1.622990
14 -158.0440 (d2)
15 -2307.6586 4.500 46.80 1.766840
16 -104.6037 0.100
17 151.1718 7.500 82.52 1.497820
18 -57.3586 2.000 37.16 1.834000
19 -129.0561 (d3)
20 (Aperture) 1.000
21 60.0000 2.000 28.46 1.728250
22 28.8113 9.000 50.23 1.719950
23 233.9935 29.871
24 -1052.9199 5.000 23.78 1.846660
25 -31.3846 2.000 34.96 1.800999
26 57.3306 5.246
27 154.0318 2.000 42.72 1.834807
28 43.0260 8.000 82.52 1.497820
29 -84.8918 0.100
30 41.1435 8.000 82.52 1.497820
31 -345.8327 10.000
32 -46.4776 2.000 42.24 1.799520
33 -74.9722 (Bf)
34 (image plane)

[Zoom lens group data]
Lens Group Focal Length First Lens Group 94.569
Second lens group -29.074
Third lens group 92.291
Fourth lens group 122.318
4a partial lens group 110.962
4b partial lens group -76.974
4c partial lens group 82.046

  Table 7 below shows variable interval data at each focal length in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the second embodiment.

(Table 7)
[Variable interval data]
Wide angle end Intermediate focal length Telephoto end
f 71.400 135.000 196.000
d1 2.000 25.737 34.011
d2 31.317 16.341 2.009
d3 21.434 12.673 18.732
Bf 53.445 53.445 53.445
Total length 259.180 259.180 259.180

  Table 8 below shows variable distance data at the time of short-distance focusing at each focal length in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the second embodiment.

(Table 8)
[Variable interval data at close focus]
Wide angle end Intermediate focal length Telephoto end β -0.040 -0.070 -0.090
d0 1690.869 1675.412 1772.094
d1 2.000 25.737 34.011
d2 32.988 21.880 12.341
d3 19.763 7.134 8.399
Bf 53.445 53.445 53.445

  Table 9 below shows focusing movement amount data at each focal length in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the second embodiment.

(Table 9)
[Focusing distance data]
Wide angle end Intermediate focal length Telephoto end
f 71.400 135.000 196.000
δ3 1.671 5.538 10.332

  Table 10 below shows values corresponding to the conditional expressions in the second embodiment. Thus, in the second embodiment, all the conditional expressions (1) and (2) are satisfied.

(Table 10)
(1) f1 / f3 = 1.03
(2) f3 / f4 = 0.76

  FIG. 7A shows an aberration diagram in the infinite focus state in the wide-angle end state of this second embodiment, FIG. 8 shows an aberration diagram in the infinite focus state in the intermediate focal length state, and FIG. FIG. 9A shows an aberration diagram in the infinitely focused state, FIG. 10A shows an aberration diagram in the near-field object focused state at the wide-angle end state, and FIG. FIG. 10B is an aberration diagram in the state, and FIG. 10C is an aberration diagram in the short-distance object focusing state in the telephoto end state. Further, FIG. 7B shows a meridional lateral aberration diagram when the shake correction is performed with respect to the rotational shake of 0.40 ° in the infinity photographing state at the wide-angle end state in the second embodiment, and FIG. FIG. 9B shows a meridional transverse aberration diagram when shake correction is performed for 0.20 ° rotational blur in the infinity photographing state at the telephoto end state. As is apparent from these respective aberration diagrams, in the second example, it is understood that various aberrations are satisfactorily corrected in each focal length state from the wide-angle end state to the telephoto end state, and excellent imaging performance is obtained.

[Third embodiment]
FIG. 11 is a diagram showing the configuration of the variable magnification optical system ZL3 according to the third example of the present invention. In the variable magnification optical system ZL3 of FIG. 11, the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a positive meniscus lens L12 having a convex surface facing the object side. , A biconvex lens L13, and a positive meniscus lens L14 having a convex surface facing the object side. The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, a cemented lens of a biconcave lens L22 and a positive meniscus lens L23 having a convex surface facing the object side, and a concave surface facing the object side The negative meniscus lens L24 facing The third lens group G3 includes, in order from the object side, a positive meniscus lens L31 having a concave surface facing the object side, and a cemented lens of a biconvex lens L32 and a negative meniscus lens L33 having a concave surface facing the object side. The fourth lens group G4 includes, in order from the object side, a 4a partial lens group G4a, a 4b partial lens group G4b, and a 4c partial lens group G4c. The 4a partial lens group G4a is disposed on the object side. Consists of a cemented lens of a negative meniscus lens L41 having a convex surface and a positive meniscus lens L42 having a convex surface facing the object side, and the fourth lens group G4b has a negative meniscus having a concave surface facing the object side in order from the object side. The fourth c partial lens group G4c is composed of a cemented lens of a lens L43 and a biconcave lens L44, and is composed of a negative meniscus lens L45 having a convex surface facing the object side and a biconvex lens L46 in order from the object side, and a biconvex lens L47. And a negative meniscus lens L48 having a concave surface facing the object side. The aperture stop S is located closest to the object side of the fourth lens group G4.

  In the wide-angle end state of the third embodiment, the image stabilization coefficient is 1.20 and the focal length is 71.4 (mm). Therefore, the first correction for correcting the rotation blur of 0.40 ° is performed. The moving amount of the 4b partial lens group G4b is 0.42 (mm). Further, in the telephoto end state of the third embodiment, since the image stabilization coefficient is 1.20 and the focal length is 196.0 (mm), the fourth b for correcting the rotation blur of 0.20 °. The moving amount of the partial lens group G4b is 0.57 (mm).

  Table 11 below lists values of specifications of the third embodiment. In Table 11, the 34th surface shows the image surface I of the variable magnification optical system ZL3 as shown in FIG.

(Table 11)
Zoom ratio 2.745
Wide angle end Intermediate focal length Telephoto end
f = 71.40 to 135.00 to 196.00
F.NO = 2.91 to 2.91 to 2.91
2ω = 34.13-17.77-12.21
Image height = 21.60 to 21.60 to 21.60

Surface number Curvature radius Surface spacing Abbe number Refractive index
0 (object surface) (d0)
1 227.5832 2.000 32.35 1.850 260
2 84.5495 10.000 82.52 1.497820
3 3639.4392 0.100
4 103.9494 8.000 82.52 1.497820
5 -7215.7012 0.100
6 81.2067 8.000 65.46 1.603001
7 754.5704 (d1)
8 263.9907 2.200 42.72 1.834807
9 33.5991 7.937
10 -75.6559 2.000 70.41 1.487490
11 40.2193 6.000 23.78 1.846660
12 441.9323 4.468
13 -46.1911 2.200 63.37 1.618000
14 -442.6275 (d2)
15 -1661.3596 4.500 42.72 1.834807
16 -91.5486 0.100
17 128.6280 7.500 82.52 1.497820
18 -60.0631 2.000 32.35 1.850 260
19 -163.2706 (d3)
20 (Aperture) 1.000
21 45.0978 2.000 23.78 1.846660
22 29.5011 10.000 49.78 1.617720
23 1494.5462 25.000
24 -174.6589 5.000 23.78 1.846660
25 -29.3273 2.000 35.04 1.749500
26 50.5294 5.000
27 104.6269 2.000 46.62 1.816000
28 37.1401 8.000 82.52 1.497820
29 -84.5560 3.777
30 40.8781 8.000 70.41 1.487490
31 -282.5154 10.000
32 -55.4388 2.000 46.62 1.816000
33 -112.8659 (Bf)
34 (image plane)

[Zoom lens group data]
Lens group Focal length 1st lens group 92.505
Second lens group -27.046
Third lens group 84.455
Fourth lens group 116.619
4a partial lens group 92.636
4b partial lens group -60.445
4c partial lens group 76.890

  Table 12 below shows variable interval data at each focal length in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the third embodiment.

(Table 12)
[Variable interval data]
Wide angle end Intermediate focal length Telephoto end
f 71.400 135.000 196.000
d1 2.000 25.227 33.371
d2 27.831 14.666 2.000
d3 21.949 11.888 16.409
Bf 48.517 48.517 48.517
Total length 251.180 251.180 251.180

  Table 13 below shows variable distance data at the time of short-distance focusing at each of the focal lengths in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the third embodiment.

(Table 13)
[Variable interval data at close focus]
Wide angle end Intermediate focal length Telephoto end β -0.040 -0.070 -0.090
d0 1690.869 1675.412 1772.094
d1 2.000 25.227 33.371
d2 27.831 14.666 2.000
d3 21.949 11.888 16.409
Bf 48.517 48.517 48.517

  Table 14 below shows focusing movement amount data at each focal length in the wide-angle end state, the intermediate focal length state, and the telephoto end state in the third embodiment.

(Table 14)
[Focusing distance data]
Wide angle end Intermediate focal length Telephoto end
f 71.400 135.000 196.000
δ3 1.439 4.748 8.868

  Table 15 below shows values corresponding to the conditional expressions in the third embodiment. Thus, in the third embodiment, all the conditional expressions (1) and (2) are satisfied.

(Table 15)
(1) f1 / f3 = 1.10
(2) f3 / f4 = 0.72

  FIG. 12A is an aberration diagram in the infinite focus state in the wide-angle end state of this third embodiment, FIG. 13 is an aberration diagram in the infinite focus state in the intermediate focal length state, and FIG. FIG. 14A is an aberration diagram in the infinite focus state, and FIG. 15A is an aberration diagram in the close focus state in the wide-angle end state. FIG. FIG. 15B is an aberration diagram in the state, and FIG. 15C is an aberration diagram in the short distance object in-focus state in the telephoto end state. Further, FIG. 12B shows a meridional lateral aberration diagram when the shake correction is performed with respect to the rotation blur of 0.40 ° in the infinity photographing state at the wide-angle end state in the third example, and FIG. FIG. 14B shows a meridional transverse aberration diagram when shake correction is performed for 0.20 ° rotational blur in the infinity shooting state at the telephoto end state. As is apparent from these aberration diagrams, in the third embodiment, it is understood that various aberrations are well corrected in each focal length state from the wide-angle end state to the telephoto end state, and excellent imaging performance is obtained. .

It is sectional drawing which shows the structure of the variable magnification optical system by 1st Example. FIG. 3A is a diagram illustrating various aberrations in the infinitely focused state according to the first embodiment, FIG. 4A is a diagram illustrating various aberrations in the wide-angle end state, and FIG. FIG. 6 is a meridional transverse aberration diagram when shake correction is performed for rotational shake. FIG. 6 is a diagram illustrating all aberrations in the intermediate focal length state according to the first example. FIG. 4A is a diagram illustrating various aberrations in the infinitely focused state according to the first embodiment, FIG. 5A is a diagram illustrating various aberrations in the telephoto end state, and FIG. 5B is 0.20 ° in the infinity photographing state in the telephoto end state. FIG. 6 is a meridional transverse aberration diagram when shake correction is performed for rotational shake. FIG. 3A is an aberration diagram in a short-distance object focusing state according to the first embodiment, FIG. 3A is an aberration diagram in a short-distance object focusing state in a wide-angle end state, and FIG. FIG. 4C is an aberration diagram in the object in-focus state, and FIG. 4C is an aberration diagram in the near-field object focus state in the telephoto end state. It is sectional drawing which shows the structure of the variable magnification optical system by 2nd Example. FIG. 7A is a diagram illustrating various aberrations in the infinitely focused state according to the second example, FIG. 9A is a diagram illustrating various aberrations in the wide-angle end state, and FIG. FIG. 6 is a meridional transverse aberration diagram when shake correction is performed for rotational shake. It is an aberration diagram of the intermediate focal length state of the second embodiment. FIG. 7A is a diagram illustrating various aberrations in the infinite focus state in the second embodiment, FIG. 9A is a diagram illustrating aberrations in the telephoto end state, and FIG. 9B is 0.20 ° in the infinity photographing state in the telephoto end state. FIG. 6 is a meridional transverse aberration diagram when shake correction is performed for rotational shake. FIG. 6A is an aberration diagram in a short-distance object in-focus state according to the second embodiment, FIG. 6A is an aberration diagram in a short-distance object in-focus state in a wide-angle end state, and FIG. FIG. 4C is an aberration diagram in the object in-focus state, and FIG. 4C is an aberration diagram in the near-field object focus state in the telephoto end state. It is sectional drawing which shows the structure of the variable magnification optical system by 3rd Example. FIG. 7A is a diagram illustrating various aberrations in the infinitely focused state according to the third example, FIG. 9A is a diagram illustrating various aberrations in the wide-angle end state, and FIG. FIG. 6 is a meridional transverse aberration diagram when shake correction is performed for rotational shake. FIG. 12 is a diagram illustrating various aberrations in the intermediate focal length state of the third example. FIG. 7A is a diagram illustrating various aberrations in the infinite focus state according to the third example, FIG. 9A is a diagram illustrating various aberrations in the telephoto end state, and FIG. 9B is 0.20 ° in the infinity photographing state in the telephoto end state. FIG. 6 is a meridional transverse aberration diagram when shake correction is performed for rotational shake. FIG. 7A is an aberration diagram in a short-distance object in-focus state according to the third example, FIG. 9A is an aberration diagram in a short-distance object in-focus state in a wide-angle end state, and FIG. FIG. 4C is an aberration diagram in the object in-focus state, and FIG. 4C is an aberration diagram in the near-field object focus state in the telephoto end state. The electronic still camera which mounts the variable magnification optical system which concerns on this invention is shown, (a) is a front view, (b) is a rear view. It is sectional drawing along the AA 'line of Fig.16 (a).

Explanation of symbols

ZL (ZL1 to ZL3) Variable magnification optical system G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group G4a 4a partial lens group G4b 4b partial lens group G4c 4c partial lens group S Aperture Aperture 1 Electronic still camera (optical equipment)

Claims (12)

  1. From the object side,
    A first lens group having a positive refractive power;
    A second lens group having negative refractive power;
    A third lens group having positive refractive power;
    Substantially consisting of four lens groups with a fourth lens group having positive refractive power,
    The fourth lens group, in order from the object side,
    A 4a partial lens group having positive refractive power;
    A 4b partial lens group having negative refractive power,
    The 4a partial lens group includes a negative meniscus lens having a convex surface facing the object side,
    There line camera shake correction by moving the second 4b partial lens group in the direction perpendicular to the optical axis,
    The third lens group performs focusing from a long distance object to a short distance object,
    When the lens position state changes from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the third lens group increases. A variable magnification optical system in which the distance between the third lens group and the fourth lens group decreases and decreases .
  2. The variable magnification optical system according to claim 1 , wherein the fourth b partial lens group includes one cemented lens.
  3. From the object side,
    A first lens group having a positive refractive power;
    A second lens group having negative refractive power;
    A third lens group having positive refractive power;
    Substantially consisting of four lens groups with a fourth lens group having positive refractive power,
    The fourth lens group, in order from the object side,
    A 4a partial lens group having positive refractive power;
    A 4b partial lens group having negative refractive power,
    The 4a partial lens group includes a negative meniscus lens having a convex surface facing the object side,
    There line camera shake correction by moving the second 4b partial lens group in the direction perpendicular to the optical axis,
    The 4b partial lens group is composed of one cemented lens,
    When the lens position state changes from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the third lens group increases. A variable magnification optical system in which the distance between the third lens group and the fourth lens group decreases and decreases .
  4. 4. The variable magnification optical system according to claim 1, wherein the fourth lens group further includes a fourth c partial lens group having a positive refractive power on the image surface side from the fourth b partial lens group. 5. .
  5. When the focal length of the first lens group is f1, and the focal length of the third lens group is f3, the following expression 0.8 <f1 / f3 <1.3
    The zoom lens system according to any one of claims 1 to 4, which satisfies the following condition.
  6. When the focal length of the third lens group is f3 and the focal length of the fourth lens group is f4, the following formula 0.5 <f3 / f4 <1.2
    The zoom lens system according to any one of claims 1 to 5, which satisfies the following condition.
  7. The zoom optical system according to any one of claims 1 to 6, wherein an aperture stop is disposed between the third lens group and the fourth lens group.
  8. When the lens position state changes from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the third lens group increases. The variable magnification optical system according to any one of claims 1 to 7 , which decreases.
  9. When the lens position state changes to the telephoto end state from the wide-angle end state, the variable magnification optical system according to any one of the first lens group preceding claims is fixed.
  10. When the lens position state from the wide-angle end state to the telephoto end state changes, the variable magnification optical system according to any one of claims 1 to 9 wherein the fourth lens group are fixed.
  11. Optical apparatus including the variable magnification optical system according to any one of claims 1 to 10.
  12. From the object side,
    A first lens group having a positive refractive power;
    A second lens group having negative refractive power;
    A third lens group having positive refractive power;
    Substantially consisting of four lens groups with a fourth lens group having positive refractive power,
    The fourth lens group, in order from the object side,
    A 4a partial lens group having positive refractive power;
    A 4b partial lens group having negative refractive power,
    The 4a partial lens group includes a negative meniscus lens having a convex surface facing the object side,
    There line camera shake correction by moving the second 4b partial lens group in the direction perpendicular to the optical axis,
    The third lens group is a row cormorants variable power optical system of the variable magnification method focusing from infinity object to a close object,
    When the lens position state changes from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the third lens group increases. A zooming method for a zooming optical system configured to decrease and change the distance between the third lens group and the fourth lens group .
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JP6033904B2 (en) * 2015-02-19 2016-11-30 株式会社シグマ Large-aperture telephoto zoom lens with anti-vibration function
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