JP2015114625A - Zoom lens and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens that has a camera shake compensation function, can give good optical performance while including a wide angle range and a standard focal distance range, and can meet demands for further reduction in size and weight.SOLUTION: The zoom lens includes, successively from an object side, a first lens group G1 having a negative refractive power as a whole, a second lens group G2 having a positive refractive power as a whole, a third lens group G3 having a negative refractive power as a whole, and a fourth lens group G4 having a negative refractive power as a whole. Upon varying magnifications from a wide angle end to a telephoto end, an air gap between the first lens group G1 and the second lens group G2 decreases; an air gap between the second lens group G2 and the third lens group G3 increases; and an air gap between the third lens group G3 and the fourth lens group G4 varies. Camera shake is compensated by moving at least a lens L7 or L8, which constitutes the third lens group G3 or the fourth lens group G4, in a plane intersecting the optical axis.

Description

  The present invention relates to a zoom lens and an imaging apparatus.

  2. Description of the Related Art Conventionally, zoom lenses having an image blur correction mechanism (also referred to as a camera shake correction mechanism or an image stabilization mechanism) that correct image blur due to camera shake or the like are widely known. In the image blur correction mechanism, an image is formed on the image plane by moving a part of the optical system (lens or lens group) constituting the zoom lens in a plane intersecting (specifically, orthogonal) with the optical axis. The image is shifted in a direction perpendicular to the optical axis, and image blur caused by vibration such as camera shake is optically corrected.

  Among such zoom lenses, in order from the object side, the zoom lens includes a first lens group having a negative refractive power as a whole and a second lens group having a positive refractive power as a whole. A zoom lens having a configuration in which all or part of the zoom lens is moved in a direction perpendicular to the optical axis is disclosed (for example, see Patent Document 1). Specifically, the following Patent Document 1 includes, in order from the object side, a first lens group having a negative refractive power as a whole and a second lens group having a positive refractive power as a whole, and the first lens group. And a zoom lens having a configuration that corrects image blur by moving the second lens group in a direction substantially perpendicular to the optical axis by changing the air gap between the second lens group and the second lens group. It is disclosed.

  Further, in order from the object side, a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, a third lens group having a negative refractive power as a whole, and the whole And a fourth lens group having a positive refractive power, and zooming is performed by changing the air spacing of each lens group, and a part of the lenses constituting the second lens group is provided with an image blur correction function. A zoom lens having the above configuration is disclosed (for example, see Patent Documents 2 and 3).

  Further, in order from the object side, a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, a third lens group having a negative refractive power as a whole, and the whole And a fourth lens group having a positive refractive power as a zoom lens having a configuration in which the third lens group has an image blur correction function by performing zooming by changing an air interval of each lens group. (For example, see Patent Documents 4 to 8.)

  However, since the zoom lens disclosed in Patent Documents 1 to 8 described above is an optical system for an interchangeable lens of a single lens reflex camera, it has a long back focus so as not to interfere with the quick return mirror of the single lens reflex camera. ing. For this reason, when it is applied to an interchangeable lens of a mirrorless single-lens camera that does not have a quick return mirror, a wasteful space is generated and it is not suitable for downsizing.

  On the other hand, in order from the object side, a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, a third lens group having a negative refractive power as a whole, and the whole And a fourth lens group having a negative refractive power, and zooming is performed by changing the air spacing of each lens group, so that the total optical length including the back focus is relatively short. (For example, refer to Patent Documents 9 to 11.)

  Among these, in the zoom lens disclosed in Patent Document 9 below, since the F number variation due to zooming is large, if the F number at the wide-angle end is set appropriately, the F number at the telephoto end becomes too dark. . On the other hand, if the telephoto end F-number is set appropriately, the wide-angle end F-number becomes too bright. For this reason, if a sufficient amount of peripheral light at the wide-angle end is ensured, there is a drawback that the front lens diameter increases.

  On the other hand, the zoom lenses disclosed in the following Patent Documents 10 and 11 solve the above-described drawbacks, but in zoom lenses other than the fourth numerical example described in the following Patent Document 11, the telephoto end F The number becomes too dark. On the other hand, the zoom lens of the fourth numerical example has a drawback that it interferes with the internal mechanism of the camera when applied to an interchangeable lens of a mirrorless single-lens camera because the back focus is too short.

JP 2008-20344 A JP 2004-61910 A JP 2008-78834 A JP-A-11-174319 JP 2001-83583 A JP 2010-217535 A JP 2012-68303 A JP-A-11-231220 Japanese Patent Laid-Open No. 3-240014 JP-A-6-175025 JP 7-201685 A

  One of the aspects of the present invention has been proposed in view of such a conventional situation. As a zoom lens having an image blur correction function, a favorable optical system is included while including a wide-angle region and a standard focal length region. It is an object of the present invention to provide a zoom lens that can achieve performance and can be further reduced in size and weight, and an imaging apparatus including such a zoom lens.

[1] The zoom lens according to the first aspect of the present invention includes, in order from the object side, a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, and a whole A third lens group having a negative refractive power as a whole and a fourth lens group having a negative refractive power as a whole, and at the time of zooming from the wide-angle end to the telephoto end, the first lens group and the first lens group The air gap between the second lens group and the third lens group is increased, the air gap between the third lens group and the fourth lens group is changed, and the third lens is changed. Image blur is corrected by moving at least a part of the lenses constituting the lens group or the fourth lens group within a plane intersecting the optical axis.

[2] In the zoom lens described in [1] 1, the fifth lens unit having a positive refractive power as a whole is provided on the image plane side of the fourth lens unit, and zooming from the wide-angle end to the telephoto end is performed. during, said fourth lens group spacing of the fifth lens group becomes large, the composite focal length of the fifth lens group and f _5, a focal length of the entire system at the wide-angle end when the f _w , 1.5 <f ₅ / f _w <9.5 may be satisfied.

[3] In the zoom lens according to [1] or [2], image blur is corrected by moving at least a part of the lenses constituting the third lens group within a plane intersecting the optical axis. In this case, when the combined focal length of the third lens group is f ₃ and the focal length of the entire system at the telephoto end is f _t , a relationship of 0.2 <| f ₃ | / _ft <1.0. It may be the composition which satisfies.

[4] In the zoom lens according to [1] or [2], image blur is corrected by moving at least a part of lenses constituting the fourth lens group in a plane intersecting the optical axis. In this case, when the combined focal length of the fourth lens group is f ₄ and the focal length of the entire system at the telephoto end is f _t , a relationship of 0.5 <| f ₄ | / _ft <2.0 is satisfied. It may be the composition which satisfies.

[5] In the zoom lens according to any one of [1] to [4], the first lens group may include an aspheric lens whose negative refractive power decreases as the distance from the optical axis increases. Good.

[6] In the zoom lens according to any one of [1] to [5], at least one of the third lens group and the fourth lens group is a lens group that corrects image blur. The structure comprised from the lens may be sufficient.

In the zoom lens according to any one of [7] above [1] to [6], a combined focal length of the first lens group and f _1, the synthetic focal length of the second lens group and f _2, the wide-angle the focal length of the entire system at the end and _{f w,} the focal length of the entire system at the telephoto end when a _{f t, 0.5 <| f 1} | / f w <2.0, 0.1 <f 2 / _f t <may be configured to satisfy 0.5 relationship.

[8] In the zoom lens according to any one of [1], [2], [4] to [7], at least a part of the lenses constituting the fourth lens group is in a plane intersecting the optical axis. In the case of correcting the image blur by moving the lens, the focusing from the object at infinity to the object at short distance may be performed by moving the third lens group in the optical axis direction.

[9] An imaging apparatus according to a second aspect of the present invention includes a zoom lens according to any one of [1] to [8], a solid-state imaging element that captures an image formed by the zoom lens, and It is characterized by providing.

  As described above, according to one aspect of the present invention, as a zoom lens having an image blur correction function, while including a wide angle region and a standard focal length region, good optical performance is obtained and further miniaturization is achieved. In addition, it is possible to provide a zoom lens that can be reduced in weight and an imaging device including such a zoom lens.

It is a block diagram of the zoom lens shown as one Embodiment of this invention. It is a schematic diagram of a mirrorless single-lens camera shown as one embodiment of the present invention. FIG. 2 is a configuration diagram illustrating lens arrangements at a wide angle end (W), an intermediate focal position (M), and a telephoto end (T) in the zoom lens according to the first exemplary embodiment. FIG. 6 is a diagram illustrating various aberrations when an object at infinity is focused at the wide-angle end of the zoom lens illustrated in Example 1; FIG. 6 is a diagram illustrating various aberrations when an object at infinity is focused at an intermediate focal length of the zoom lens illustrated in Embodiment 1; FIG. 6 is a diagram illustrating various aberrations when focusing on an object at infinity at the telephoto end of the zoom lens illustrated in Example 1; FIG. 3 is a lateral aberration diagram at the wide-angle end in the zoom lens according to Example 1; FIG. 3 is a lateral aberration diagram at an intermediate focal length in the zoom lens of Example 1; FIG. 3 is a lateral aberration diagram at the telephoto end in the zoom lens according to Example 1; FIG. 5 is a configuration diagram illustrating lens arrangements at a wide angle end (W), an intermediate focal position (M), and a telephoto end (T) in the zoom lens according to the second exemplary embodiment. FIG. 6 is a diagram illustrating various aberrations when an object at infinity is in focus at the wide angle end of the zoom lens illustrated in Example 2; FIG. 12 is a diagram illustrating various aberrations when an object at infinity is in focus at the intermediate focal length of the zoom lens illustrated in Example 2; FIG. 10 is a diagram illustrating various aberrations when an object at infinity is in focus at the telephoto end of the zoom lens illustrated in Example 2; FIG. 6 is a lateral aberration diagram at the wide-angle end in the zoom lens according to Example 2. 6 is a lateral aberration diagram at an intermediate focal length in the zoom lens of Example 2. FIG. FIG. 6 is a lateral aberration diagram at the telephoto end in the zoom lens according to Example 2; FIG. 6 is a configuration diagram illustrating lens arrangements at a wide-angle end (W), an intermediate focal position (M), and a telephoto end (T) in the zoom lens according to Embodiment 3; FIG. 10 is a diagram illustrating various aberrations when focusing on an object at infinity at the wide angle end of the zoom lens illustrated in Example 3; FIG. 12 is a diagram illustrating various aberrations when an object at infinity is in focus at the intermediate focal length of the zoom lens illustrated in Example 3; FIG. 10 is a diagram illustrating various aberrations when an object at infinity is in focus at the telephoto end of the zoom lens illustrated in Example 3; 6 is a lateral aberration diagram at a wide-angle end in the zoom lens according to Example 3. FIG. 6 is a lateral aberration diagram at an intermediate focal length in the zoom lens of Example 3. FIG. FIG. 6 is a lateral aberration diagram at a telephoto end in the zoom lens according to Example 3; FIG. 6 is a configuration diagram illustrating lens arrangements at a wide-angle end (W), an intermediate focal position (M), and a telephoto end (T) in the zoom lens according to a fourth exemplary embodiment. FIG. 12 is a diagram illustrating various aberrations when an object at infinity is in focus at the wide angle end of the zoom lens illustrated in Example 4; FIG. 10 is a diagram illustrating various aberrations when an object at infinity is in focus at the intermediate focal length of the zoom lens illustrated in Example 4; FIG. 10 is a diagram illustrating various aberrations when focusing on an object at infinity at the telephoto end of the zoom lens illustrated in Example 4; FIG. 10 is a lateral aberration diagram at a wide-angle end in the zoom lens according to Example 4; FIG. 10 is a lateral aberration diagram at an intermediate focal length in the zoom lens according to Example 4; FIG. 10 is a lateral aberration diagram at the telephoto end in the zoom lens according to Example 4; FIG. 10 is a configuration diagram illustrating a lens arrangement at a wide angle end (W), an intermediate focal position (M), and a telephoto end (T) in the zoom lens according to a fifth exemplary embodiment. FIG. 10 is a diagram illustrating all aberrations when an object at infinity is in focus at the wide angle end of the zoom lens illustrated in Example 5; FIG. 10 is a diagram illustrating various aberrations when an object at infinity is in focus at the intermediate focal length of the zoom lens illustrated in Example 5; FIG. 10 is a diagram illustrating various aberrations when an object at infinity is in focus at the telephoto end of the zoom lens illustrated in Example 5; FIG. 10 is a lateral aberration diagram at the wide-angle end in the zoom lens according to Example 5. FIG. 10 is a lateral aberration diagram at an intermediate focal length in the zoom lens according to Example 5; FIG. 10 is a lateral aberration diagram at the telephoto end in the zoom lens according to Example 5; FIG. 10 is a configuration diagram illustrating a lens arrangement at a wide angle end (W), an intermediate focal position (M), and a telephoto end (T) in a zoom lens according to a sixth exemplary embodiment. FIG. 10 is a diagram illustrating various aberrations when an infinitely far object is focused at the wide angle end of the zoom lens illustrated in Example 6; FIG. 10 is a diagram illustrating various aberrations when an object at infinity is in focus at the intermediate focal length of the zoom lens illustrated in Example 6; FIG. 10 is a diagram illustrating various aberrations when focusing on an object at infinity at the telephoto end of the zoom lens illustrated in Example 6; FIG. 12 is a lateral aberration diagram at the wide-angle end in the zoom lens according to Example 6; FIG. 10 is a lateral aberration diagram at an intermediate focal length in the zoom lens according to Example 6; 12 is a lateral aberration diagram at a telephoto end in a zoom lens according to Example 6; FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Note that the lens data and the like exemplified in the following description are merely examples, and the present invention is not necessarily limited thereto, and can be appropriately modified and implemented without changing the gist thereof.

FIG. 1 is a configuration diagram of a zoom lens shown as an embodiment of the present invention.
As shown in FIG. 1, the zoom lens according to the present embodiment is used as an imaging optical system of an imaging apparatus such as an interchangeable lens system camera, a digital still camera, a digital video camera, or a surveillance camera. Among these, it is particularly preferably used as an interchangeable lens for a mirrorless single-lens camera.

  Specifically, the zoom lens shown in FIG. 1 includes, in order from the object side, a first lens group G1 having a negative refractive power as a whole, a second lens group G2 having a positive refractive power as a whole, and a negative as a whole. A third lens group G3 having a negative refractive power, a fourth lens group G4 having a negative refractive power as a whole, and a fifth lens group G5 having a positive refractive power as a whole. That is, this zoom lens constitutes a five-group zoom lens composed of negative, positive, negative, negative, and positive lens groups G1 to G5.

  The first lens group G1 includes at least two negative lenses L1 and L2 and one positive lens L3. Specifically, the first lens group G1 includes, in order from the object side, a negative lens L1 having a convex surface on the object side, a negative lens L2 having concave surfaces, and a positive lens having a convex surface on the object side. L3 is arranged. In addition, the first lens group G1 includes an aspheric lens whose negative refractive power decreases as the distance from the optical axis O increases.

  The first lens group G1 includes, in order from the object side, a negative lens L1 having a convex surface on the object side and a negative lens L2 having both surfaces concave. As a result, the negative refractive power is distributed to the two lenses, and the coma and distortion at the wide-angle end are corrected well. In particular, it is possible to satisfactorily correct coma at the wide-angle end by using a biconcave lens as the negative lens L2 located second from the object side.

  In the first lens group G1, a meniscus positive lens L3 having a convex surface on the object side is disposed after the two negative lenses L1 and L2 (image surface side). As a result, it is possible to satisfactorily correct chromatic aberration that occurs in the first lens group G1 and spherical aberration at the telephoto end.

  Further, in the first lens group G1, at least one surface of any one of the lenses L1, L2, and L3 constituting the first lens group G1 is an aspheric surface whose negative refractive power decreases as it moves away from the optical axis. As a result, it is possible to satisfactorily correct curvature of field and negative distortion particularly at the wide-angle end. The aspherical surface is preferably provided on the negative lens L2 located second from the object side. Thereby, size reduction of an aspherical lens can be achieved.

  The second lens group G2 includes a second A lens part group G2A having a positive refractive power as a whole and a second B lens part group G2B having a positive refractive power as a whole in order from the object side. .

  The second lens group G2 is a main lens group for performing zooming. The second lens group G2 is required to have a strong positive refractive power in order to shorten the total lens length. In response to such a demand, in the second lens group G2, the second A lens portion group G2A and the second B lens portion group G2B have a positive refractive power with an air interval as a boundary, thereby providing a strong positive refractive power. Is distributed. In the zoom lens according to the present embodiment, such a configuration makes it possible to satisfactorily correct spherical aberration and further reduce the overall length of the lens.

  The second A lens portion group G2A includes a biconvex lens L4 whose both surfaces are convex, and at least one surface is an aspherical surface. The second B lens subgroup G2B is composed of a cemented lens in which, from the object side, a negative lens L5 having a convex surface on the object side and a positive lens L6 having a convex surface on the object side are cemented.

  In the second A lens portion group G2A, spherical aberration can be favorably corrected by making at least one surface of the biconvex lens L4 an aspherical surface. Further, the zoom lens 1 can be reduced in size by using the biconvex lens L4 for the second A lens group G2A.

  In the second B lens portion group G2B, the chromatic aberration generated in the second B lens portion group G2B can be satisfactorily suppressed by disposing the negative lens L5 on the object side. In addition, spherical aberration is satisfactorily corrected by the cemented surface of the negative lens L5 and the positive lens L6 constituting the cemented lens.

  In the second B lens portion group G2B, it is preferable to dispose a negative lens L5 having a convex surface on the object side. As a result, the distance from the aperture stop SP disposed between the second A lens portion group G2A and the second B lens portion group G2B can be minimized, and the overall length of the second lens group G2 can be suppressed. Therefore, for example, when the lens barrel is retracted for compact housing, the retracted thickness can be reduced.

  The third lens group G3 includes one negative lens L7. The negative lens L7 is a meniscus lens having a convex surface on the object side, and at least one surface is an aspherical surface. In the zoom lens according to the present embodiment, the third lens group G3 is configured by a single negative lens L7 to reduce the weight. In particular, in the zoom lens according to the present embodiment, the third lens group G3 is provided with a focus function. Therefore, by reducing the weight of the third lens group G3, the lens driving mechanism can be reduced in size and quickly. Focusing becomes possible. In the third lens group G3, by making at least one surface of the negative lens L7 an aspherical surface, it is possible to satisfactorily correct variations in various aberrations, particularly coma, during zooming and focusing. .

  The fourth lens group G4 includes one negative lens L8. The negative lens L8 is a meniscus lens having a convex surface on the object side, and at least one surface is an aspherical surface. In the zoom lens according to the present embodiment, the fourth lens group G4 is configured by a single negative lens L8 to reduce the weight. In the fourth lens group G4, at least one surface of the negative lens L8 is aspherical, so that the variation in field curvature that occurs during zooming from the wide-angle end to the telephoto end is corrected well. .

  The aperture stop SP limits the diameter (light quantity) of the light beam incident from the object side to the image plane IP side. The aperture stop SP moves in the optical axis direction together with the second lens group G2 during zooming. In the zoom lens of the present embodiment, the aperture stop SP is disposed between the second A lens portion group G2A and the second B lens portion group G2B constituting the second lens group G2 (inside the second lens group G2). The drive mechanism (not shown) for moving the second lens group G2 and the aperture stop SP in the optical axis direction can be a so-called nested structure. As a result, space efficiency is improved, which is advantageous for downsizing.

  Note that the zoom lens according to the present embodiment has a configuration in which the aperture stop SP is disposed inside the second lens group G2 described above. However, the present invention is not limited to this configuration, and is adjacent to the second lens group G2. The configuration may be such that the aperture stop SP is disposed at the position.

  The fifth lens group G5 includes one positive lens L9. The positive lens L9 is a meniscus lens having a convex surface on the image side, and at least one surface is an aspherical surface. In the zoom lens according to the present embodiment, the total thickness of the optical system is reduced by configuring the fifth lens group G5 with one positive lens L9, thereby reducing the size of the entire apparatus. In the fifth lens group G5, at least one surface of the positive lens L9 is aspheric, so that positive distortion particularly at the telephoto end is corrected favorably.

  An optical block G is disposed between the fifth lens group G5 and the image plane IP. The optical block G corresponds to an optical filter, a face plate, a crystal low-pass filter, an infrared cut filter, or the like.

  In an imaging apparatus including the zoom lens according to the present embodiment and a solid-state imaging element, the image plane IP corresponds to the imaging plane of the solid-state imaging element. As the solid-state imaging device, for example, a photoelectric conversion device such as a charge coupled device (CCD) or a complementary metal-oxide semiconductor device (CMOS) sensor can be used.

  In the imaging apparatus, light incident from the object side of the zoom lens according to the present embodiment finally forms an image on the imaging surface of the solid-state imaging device. Then, the light received by the solid-state imaging device is photoelectrically converted and output as an electrical signal, and a digital image corresponding to the image of the subject is generated. The digital image can be recorded on a recording medium such as an HDD (Hard Disk Drive), a memory card, an optical disk, or a magnetic tape. When the imaging device is a silver salt film camera, the image plane IP corresponds to the film plane.

  An example of an imaging apparatus in which the zoom lens of this embodiment is applied to the interchangeable lens 101 of the mirrorless single-lens camera 100 is shown in FIG. In the mirrorless single-lens camera 100 shown in FIG. 2, the interchangeable lens 101 configured by the zoom lens of the present embodiment is detachably attached to the camera body 102. In addition, a solid-state image sensor 103 is disposed inside the camera body 102 at a position corresponding to the image plane IP of the zoom lens according to the present embodiment.

  In the zoom lens of the present embodiment, when zooming from the wide-angle end to the telephoto end, as shown in FIG. 1, the air gap between the first lens group G1 and the second lens group G2 becomes small, and the second lens The air gap between the group G2 and the third lens group G3 is large, the air gap between the third lens group G3 and the fourth lens group G4 is changed, and the air gap between the fourth lens group G4 and the fifth lens group G5 is large. Thus, the lens groups G1 to G4 other than the fifth lens group G5 are moved in the optical axis direction.

  Specifically, at the time of zooming from the wide-angle end to the telephoto end, the first lens group G1 moves so as to draw a locus that is convex toward the image plane side, as indicated by an arrow a in FIG. Further, the second lens group G2 and the aperture stop SP move from the image plane side to the object side as indicated by an arrow b in FIG. The third lens group G3 moves from the image plane side to the object side, as indicated by arrows c1 and c2 in FIG. The fourth lens group G4 moves from the image plane side to the object side as indicated by an arrow d in FIG.

  In the zoom lens according to the present embodiment, the third lens group G3 moves from the object side to the image plane side when performing focusing from an object at infinity to an object at a short distance. Note that an arrow c1 indicated by a solid line and an arrow c2 indicated by a broken line in FIG. 1 indicate image planes accompanying zooming from the wide-angle end to the telephoto end when focusing on an object at infinity and an object at close distance, respectively. The movement trajectory for correcting the fluctuation is shown.

  In the zoom lens according to the present embodiment, as indicated by an arrow e in FIG. 1, the fourth lens group G4 (lens L8) is moved in a plane intersecting (specifically, orthogonal) with the optical axis O. As a result, the image formed on the image plane IP can be shifted in the direction perpendicular to the optical axis O, and image blur caused by vibration such as hand shake can be optically corrected. When moving the lens in the direction orthogonal to the optical axis O during image blur correction, if a sufficient amount of movement can be secured to shift the image formed on the image plane IP in the direction perpendicular to the optical axis O, Even if there is a deviation from the direction orthogonal to the optical axis O, image blur correction (anti-shake) can be performed.

  In the zoom lens of the present embodiment, the fourth lens group G4 is composed of a single lens L8. As a result, it is possible to reduce the size of a drive mechanism (not shown) for moving the fourth lens group G4 (lens L8) in a direction orthogonal to the optical axis O, and quick image blur correction ( Anti-vibration) can be performed.

  In the zoom lens according to the present embodiment, the fourth lens group G4 (lens L8) is moved in a direction orthogonal to the optical axis O. However, the third lens group is used instead of the fourth lens group G4. A configuration in which image blur correction (anti-shake) is performed by moving G3 (lens L7) in a direction orthogonal to the optical axis O is also possible.

  In the zoom lens according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 is increased on the wide-angle end side, so that a so-called retrofocus type configuration is obtained, and widening of the angle is facilitated. On the other hand, on the telephoto end side, the air gap between the first lens group G2 and the second lens group G2 is made small to have a positive refractive power as a whole, and the air gap between the second lens group G2 and the third lens group G3 is made large. By so doing, a so-called telephoto type configuration is obtained, and telephoto is easily achieved.

  Further, in the zoom lens according to the present embodiment, when the magnification is changed from the wide-angle end to the telephoto end, the image plane variation accompanying the magnification change is made by changing the air gap between the third lens group G3 and the fourth lens group G4. It is easy to correct.

  In the zoom lens according to the present embodiment, in order to reduce the size of the entire lens system, the third lens group G3 is moved in the optical axis direction, thereby focusing from an object at infinity to a near object. Yes. In the case of a zoom lens including a wide-angle region, the lens group on the object side or the image plane side passes off a position where the off-axis light beam is far away from the optical axis O, so the outer diameter of the lens group tends to be large. Further, since the second lens group G2 is located on the object side integrally with the first lens group G1 at the telephoto end, the F-number light beam passes through a position relatively away from the optical axis O. In this case, if the diameter is reduced, a bright F number cannot be secured. In the third lens group G3 and the fourth lens group G4, off-axis rays pass through positions relatively close to the optical axis O, and F-number rays at the telephoto end are also converged by the second lens group G to be optical axes. Since it passes through a position close to O, downsizing is easy. Furthermore, if the third lens group G3 or the fourth lens group G4 is employed as a lens group for image blur correction (anti-shake), it is advantageous in reducing the size of the entire lens system.

  In the zoom lens according to the present embodiment, the fourth lens group G4 (lens L8) is used as a lens group for image blur correction (anti-shake), and the third lens group G3 (lens L7) is used for focusing. By using the lens group, the lateral magnification of the fourth lens group G4 can be made constant regardless of the object distance, so that it is easy to secure optical performance during image blur correction (anti-shake).

  Further, in the zoom lens according to the present embodiment, when changing the magnification from the wide-angle end to the telephoto end, the air gap between the fourth lens group G4 and the fifth lens group G5 is increased so that the telephoto end is larger than the wide-angle end. Since off-axis rays pass around the fifth lens group G5, it becomes easy to correct positive distortion at the telephoto end. Further, the mechanism can be simplified by fixing the fifth lens group G5 to the image plane IP during zooming from the wide-angle end to the telephoto end.

In the zoom lens of this embodiment, a composite focal length of the fifth lens group G5 and f _5, a focal length of the entire system at the wide-angle end when the f _w, satisfying the relation of the following conditional expressions (1) Is preferred.
1.5 <f ₅ / f _w <9.5 (1)

Condition (1) is obtained by defining a composite focal length f ₅ of the fifth lens group G5, if the composite focal length f ₅ of the fifth lens group G5 in the range of the condition (1), Correction of positive distortion at the telephoto end and securing of an appropriate back focus can both be achieved.

In the zoom lens according to the present embodiment, it is more preferable that the following conditional expression (1) ′ is satisfied.
2.5 <f ₅ / f _w <7.0 (1) ′

In the zoom lens of this embodiment, a composite focal length of the fourth lens group G4 and f _4, a focal length of the entire system at the telephoto end when a f _t, satisfying the relation of the following conditional expressions (2) Is preferred.
0.5 <| f ₄ | / f _t <2.0 (2)

Condition (2), defines a fourth composite focal length f ₄ of the lens group G4 when moving in a direction perpendicular to the optical axis O of the fourth lens group G4 as lens unit for image stabilizing (image stabilization) It is a thing. If the composite focal length f ₄ of the fourth lens group G4 in the range of the condition (2), the image blur correction (image stabilization) during the fourth lens group G4 (lens L8) in a direction perpendicular to the optical axis O It becomes easy to suppress the amount of movement during the movement, and it becomes easy to secure the optical performance at the time of image blur correction (anti-shake) at the telephoto end.

In the zoom lens according to the present embodiment, it is more preferable that the following conditional expression (2) ′ is satisfied.
1.0 <| f ₄ | / f _t <1.5 (2) ′

On the other hand, when the third lens group G3 is moved in the direction perpendicular to the optical axis O as a lens group for image blurring (anti-shake) instead of the fourth lens group G4, the combined focal length of the third lens group G3 is set. and f _3, the focal length of the whole system at the telephoto end when a f _t, it is preferable to satisfy the relation of the following conditional expression (3).
0.2 <| f ₃ | / f _t <1.0 (3)

Condition (3), defines the combined focal length f ₃ of the third lens group G3 when moving in a direction perpendicular to the optical axis O of the third lens group G3 as a lens unit for image blurring (image stabilization) It is a thing. If the composite focal length f ₃ of the third lens group G3 in the range of the condition (3), image blur correction (image stabilization) at the third lens group G3 (lens L7) in a direction perpendicular to the optical axis O It is easy to suppress the amount of movement when moving, and it is easy to ensure the vibration-proof optical performance particularly at the telephoto end.

In the zoom lens according to the present embodiment, it is more preferable that the following conditional expression (3) ′ is satisfied.
0.4 <| f ₃ | / f _t <0.9 (3) ′

In the zoom lens of this embodiment, a composite focal length of the first lens group G1 and f _1, the synthetic focal length of the second lens group G2 and f _2, a focal length of the entire system at the wide angle end and f _w, telephoto the focal length of the entire system at the end when the f _t, the following conditional expression (4), it is preferable to satisfy the relation (5).
0.5 <| f ₁ | / f _w <2.0 (4)
_{0.1 <f 2 / f t <} 0.5 ... (5)

The conditional expression (4) is obtained by defining the composite focal length f ₁ of the first lens group G1, it falls below the upper limit of the condition (4), size of the front lens diameter can be facilitated. On the other hand, if the lower limit value of the conditional expression (4) is exceeded, it becomes easy to correct negative distortion at the wide angle end.

The conditional expression (5) is obtained by defining the composite focal length f ₂ of the second lens group G2, if falls below the upper limit of the condition (5), to ensure the power of the telephoto type at the telephoto end It becomes easy. This facilitates securing a bright F number at the telephoto end. If the lower limit of conditional expression (5) is exceeded, spherical aberration can be easily corrected at the telephoto end.

In the zoom lens according to the present embodiment, it is preferable that the following conditional expressions (4) ′ and (5) ′ are satisfied.
1.0 <| f ₁ | / f _w <1.5 (4) ′
_{0.2 <f 2 / f t <} 0.4 ... (5) '

  In the zoom lens according to the present embodiment that satisfies the above-described conditions, the zoom lens having an image blur correction function can provide a good optical performance and a further small size while including a wide angle region and a standard focal length region. It is possible to cope with reduction in weight and weight.

Note that the present invention is not necessarily limited to the zoom lens of the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the zoom lens of the above embodiment, a lens group having a refractive power, a converter lens group, or the like can be disposed on the object side of the first lens group G1 as necessary.

  Hereinafter, the effects of the present invention will be made clearer by examples. In addition, this invention is not limited to a following example, In the range which does not change the summary, it can change suitably and can implement.

Example 1
The configuration of the zoom lens based on the design data of Example 1 is shown in FIG. In FIG. 3, (W) shows the lens arrangement at the wide-angle end, (T) shows the lens arrangement at the intermediate focal position, and (T) shows the lens arrangement at the telephoto end.

  The zoom lens of Example 1 shown in FIG. 3 has the same lens configuration as that of the zoom lens shown in FIG. 1, and has the same zooming and focusing and image blur correction lenses as those of the zoom lens shown in FIG. Perform the action. Therefore, in FIG. 3, the same reference numerals are assigned to the same parts as those of the zoom lens shown in FIG.

  The design data of the zoom lens of Example 1 is as shown in Tables 1A to 1D below.

It should be noted that the surface number “i” (i represents a natural number) shown in Table 1A is the lens surface of the lens closest to the object side among the lenses constituting the zoom lens, and is on the image surface side. The number of the lens surface which increases sequentially as it goes is shown.
Further, among the lenses “LjRk (j represents a natural number, k represents 1 or 2)” shown in Table 1A, L represents a lens located closest to the object among the lenses constituting the zoom lens. As the second, the numbers of the lenses that sequentially increase toward the image plane side are shown. On the other hand, R indicates that the lens surface on the object side of each lens is 1, and the lens surface on the image plane side is 2. “Aperture” and “optical block (plane)” are also described together.
In addition, “r” shown in Table 1A is a curvature radius [mm] of the lens surface corresponding to each surface number (however, a surface where the value of R is ∞ indicates that the surface is a plane). Is shown.
Further, “d” shown in Table 1A indicates the axial upper surface distance [mm] between the i-th lens surface and the i + 1-th lens surface from the object side, and when variable, the wide-angle end, the intermediate focal position, The axial distance [mm] at the telephoto end is shown in the attached table.
“Nd” shown in Table 1A indicates the refractive index of each lens.
In addition, “νd” shown in Table 1A indicates the Abbe number of each lens.

  Table 1B shows the focal length of the entire system at the wide angle end, the intermediate focal position, and the telephoto end, and “d” shown in Table 1A, where the axial top surface spacing is variable (D1 to D4). [Mm].

  Table 1C shows the surface numbers of aspherical lenses and their aspherical coefficients. The aspherical surface can be expressed by the following aspherical formula X with the displacement in the optical axis direction at the position of the height H from the optical axis as a reference. “R” represents a radius of curvature, “K” represents a conic constant, and “A4, A6, A8, A10” represents an aspheric coefficient. In addition, the notation “E ± m” (m represents an integer) in the numerical value of the aspheric coefficient means “× 10 ± m”.

Table 1D includes (1) “f ₅ / f _w ”, (2) “| f ₄ | / f _t ”, (3) “| f ₃ | / f _t ”, (4) “| f ₁ | / F _w ”, (5)“ f ₂ / f _t ”.

  FIG. 4A shows various aberration diagrams (spherical aberration diagram, astigmatism diagram, distortion aberration diagram) when the zoom lens of Example 1 configured as described above is focused on an object at infinity at the wide-angle end. FIG. 4B shows various aberration diagrams when focusing on an object at infinity at the intermediate focal length, and FIG. 4C shows various aberration diagrams when focusing on an object at infinity at the telephoto end.

In each spherical aberration diagram shown in FIGS. 4A to 4C, the spherical aberration at the C-line (wavelength of about 656 nm) is “sign C”, the spherical aberration at the d-line (wavelength of about 588 nm) is “code d”, and the e-line ( Spherical aberration at the wavelength of about 546 nm) is “sign e”, spherical aberration at the F line (blue, wavelength of about 486 nm) is “sign F”, and spherical aberration at the g line (blue, wavelength of about 436 nm) is “sign g”. Show.
On the other hand, in each of the astigmatism diagrams shown in FIGS. 4A to 4C, astigmatism with respect to sagittal rays of each wavelength is indicated by “solid line”, and astigmatism with respect to tangential rays of each wavelength is indicated by “broken line”.
On the other hand, in each distortion aberration diagram shown in FIGS. 4A to 4C, distortion aberration (distortion) at the e-line is shown.

  Further, FIGS. 5A to 5C show lateral aberration diagrams at the infinity in-focus position at the time of image blur correction (anti-shake) of the zoom lens of Example 1. FIG. 5A is a lateral aberration diagram at the wide-angle end in the zoom lens of Example 1. FIG. FIG. 5B is a transverse aberration diagram at an intermediate focal length in the zoom lens of Example 1. FIG. 5C is a lateral aberration diagram at the telephoto end in the zoom lens of Example 1. FIG.

  5A to 5C, (a-1), (a-2), and (a-3) are image heights Y = 10.0 (mm), Y = 0 (mm), and Y = −, respectively. The meridional lateral aberration (mm) at 10.0 (mm) is shown, and (b-1), (b-2), and (b-3) show the sagittal lateral aberration (mm) corresponding to each. The calculation condition for image blur correction (anti-shake) is 0.3 degree anti-shake at a wavelength of 546.1 nm.

  The zoom lens of Example 1 satisfies the conditions of the present invention as shown in Tables 1A to 1D. And as for the zoom lens of Example 1, it turns out that each aberration is favorably corrected as shown in FIGS. 4A to 4C and FIGS. 5A to 5C.

(Example 2)
The configuration of the zoom lens based on the design data of Example 2 is shown in FIG. The zoom lens of Example 2 shown in FIG. 6 has the same lens configuration as that of the zoom lens shown in FIG. 1, and has the same zooming and focusing and image blur correction as those of the zoom lens shown in FIG. The lens operation is performed. Therefore, in FIG. 6, the same reference numerals are assigned to the same parts as those of the zoom lens shown in FIG.

  The design data of the zoom lens shown in Example 2 is as shown in Tables 2A to 2D below. In addition, about the description method of Table 2A-Table 2D, it is the same as that of the case of Table 1A-Table 1D.

  For the zoom lens of Example 2 configured as described above, various aberration diagrams (spherical aberration diagram, astigmatism diagram, distortion diagram) when focusing on an object at infinity at the wide angle end are shown in FIG. FIG. 7B shows various aberration diagrams when focusing on an object at infinity at the intermediate focal length, and FIG. 7C shows various aberration diagrams when focusing on an object at infinity at the telephoto end. In addition, about the description method of FIG. 7A-FIG. 7C, it is the same as that of the case shown to FIG. 4A-FIG. 4C.

  8A to 8C show lateral aberration diagrams at the infinity in-focus position at the time of image blur correction of the zoom lens of Example 2. FIG. FIG. 8A is a lateral aberration diagram at the wide-angle end in the zoom lens according to Example 2. FIG. 8B is a transverse aberration diagram at an intermediate focal length in the zoom lens of Example 2. FIG. 8C is a transverse aberration diagram at the telephoto end in the zoom lens according to Example 2. In addition, about the description method of FIG. 8A-FIG. 8C, it is the same as that of the case shown to FIG. 5A-FIG. 5C.

  The zoom lens of Example 2 satisfies the conditions of the present invention as shown in Tables 2A to 2D. As for the zoom lens of Example 2, it can be seen that each aberration is well corrected as shown in FIGS. 7A to 7C and FIGS. 8A to 8C.

(Example 3)
The configuration of the zoom lens based on the design data of Example 3 is shown in FIG. The zoom lens of Example 3 shown in FIG. 9 has the same lens configuration as that of the zoom lens shown in FIG. 1, and has the same zooming and focusing and image shake correction as those of the zoom lens shown in FIG. The lens operation is performed. Therefore, in FIG. 9, the same reference numerals are assigned to the same parts as those of the zoom lens shown in FIG.

  The design data of the zoom lens shown in Example 3 is as shown in Tables 3A to 3D below. In addition, about the description method of Table 3A-Table 3D, it is the same as that of the case of Table 1A-Table 1D.

  FIG. 10A illustrates various aberration diagrams (spherical aberration diagram, astigmatism diagram, distortion aberration diagram) when the zoom lens of Example 3 configured as described above is focused on an object at infinity at the wide-angle end. FIG. 10B shows various aberration diagrams when focusing on an infinite object at the intermediate focal length, and FIG. 10C shows various aberration diagrams when focusing on an infinite object at the telephoto end. In addition, about the description method of FIG. 10A-FIG. 10C, it is the same as that of the case shown to FIG. 4A-FIG. 4C.

  In addition, FIGS. 11A to 11C show lateral aberration diagrams at the infinity in-focus position at the time of image blur correction of the zoom lens of Example 3. FIG. FIG. 11A is a lateral aberration diagram at the wide-angle end in the zoom lens according to Example 3. FIG. 11B is a transverse aberration diagram at an intermediate focal length in the zoom lens of Example 3. FIG. 11C is a lateral aberration diagram at the telephoto end in the zoom lens according to Example 3. In addition, about the description method of FIG. 11A-FIG. 11C, it is the same as that of the case shown to FIG. 5A-FIG. 5C.

  The zoom lens of Example 3 satisfies the conditions of the present invention as shown in Tables 3A to 3D. And as for the zoom lens of this Example 3, as shown in FIG. 10A-FIG. 10C and FIG. 11A-FIG. 11C, it turns out that each aberration is correct | amended favorably.

Example 4
The configuration of the zoom lens based on the design data of Example 4 is shown in FIG. The zoom lens of Example 4 shown in FIG. 12 has the same lens configuration as that of the zoom lens shown in FIG. 1, and has the same zooming and focusing and image blur correction as those of the zoom lens shown in FIG. The lens operation is performed. Accordingly, in FIG. 12, the same reference numerals are assigned to the same parts as those of the zoom lens shown in FIG.

  The design data of the zoom lens shown in Example 4 is as shown in Tables 4A to 4D below. In addition, about the description method of Table 4A-Table 4D, it is the same as that of the case of Table 1A-Table 1D.

  For the zoom lens of Example 4 configured as described above, various aberration diagrams (spherical aberration diagram, astigmatism diagram, distortion aberration diagram) when focusing on an object at infinity at the wide angle end are shown in FIG. FIG. 13B shows various aberrations when focusing on an object at infinity at the intermediate focal length, and FIG. 13C shows various aberrations when focusing on an object at infinity at the telephoto end. In addition, about the description method of FIG. 13A-FIG. 13C, it is the same as that of the case shown to FIG. 4A-FIG. 4C.

  14A to 14C show lateral aberration diagrams at the infinity in-focus position at the time of image shake correction of the zoom lens of Example 4. FIG. FIG. 14A is a lateral aberration diagram at the wide-angle end in the zoom lens according to Example 4. FIG. 14B is a lateral aberration diagram at an intermediate focal length in the zoom lens of Example 4. FIG. 14C is a lateral aberration diagram at the telephoto end in the zoom lens according to Example 4; 14A to 14C are the same as those shown in FIGS. 5A to 5C.

  The zoom lens of Example 4 satisfies the conditions of the present invention as shown in Tables 4A to 4D. And as for the zoom lens of Example 4, as shown in FIGS. 13A to 13C and FIGS. 14A to 14C, it can be seen that each aberration is well corrected.

(Example 5)
The configuration of the zoom lens based on the design data of Example 5 is shown in FIG. The zoom lens of Example 5 shown in FIG. 15 has the same lens configuration as that of the zoom lens shown in FIG. 1, and has the same zooming and focusing and image blur correction as those of the zoom lens shown in FIG. The lens operation is performed. Therefore, in FIG. 15, the same reference numerals are given to the same parts as those of the zoom lens shown in FIG.

  The design data of the zoom lens shown in Example 5 is as shown in Tables 5A to 5D below. In addition, about the description method of Table 5A-Table 5D, it is the same as that of the case of Table 1A-Table 1D.

  FIG. 16A illustrates various aberration diagrams (spherical aberration diagram, astigmatism diagram, distortion aberration diagram) when the zoom lens of Example 5 configured as described above is focused on an object at infinity at the wide-angle end. FIG. 16B shows various aberration diagrams when focusing on an infinite object at the intermediate focal length, and FIG. 16C shows various aberration diagrams when focusing on an infinite object at the telephoto end. In addition, about the description method of FIG. 16A-FIG. 16C, it is the same as that of the case shown to FIG. 4A-FIG. 4C.

  In addition, FIGS. 17A to 17C are lateral aberration diagrams at the infinitely focused position at the time of image shake correction of the zoom lens of Example 5. FIGS. FIG. 17A is a lateral aberration diagram at the wide-angle end in the zoom lens according to Example 5. FIG. 17B is a transverse aberration diagram at an intermediate focal length in the zoom lens of Example 5. FIG. 17C is a lateral aberration diagram at the telephoto end in the zoom lens of Example 5. In addition, about the description method of FIG. 17A-FIG. 17C, it is the same as that of the case shown to FIG. 5A-FIG. 5C.

  The zoom lens of Example 5 satisfies the above-described conditions of the present invention as shown in Tables 5A to 5D. And as for the zoom lens of Example 5, it turns out that each aberration is favorably corrected as shown in FIGS. 16A to 16C and FIGS. 17A to 17C.

(Example 6)
The configuration of the zoom lens based on the design data of Example 6 is shown in FIG. The zoom lens of Example 6 shown in FIG. 18 has the same lens configuration as that of the zoom lens shown in FIG. 1, and has the same zooming and focusing and image shake correction as those of the zoom lens shown in FIG. The lens operation is performed. Therefore, in FIG. 18, the same reference numerals are assigned to the same parts as those of the zoom lens shown in FIG.

  The design data of the zoom lens shown in Example 6 is as shown in Tables 6A to 6D below. In addition, about the description method of Table 6A-Table 6D, it is the same as that of the case of Table 1A-Table 1D.

  FIG. 19A shows various aberration diagrams (spherical aberration diagram, astigmatism diagram, distortion aberration diagram) when the zoom lens of Example 6 configured as described above is focused on an object at infinity at the wide-angle end. FIG. 19B shows various aberration diagrams when focusing on an object at infinity at the intermediate focal length, and FIG. 19C shows various aberration diagrams when focusing on an object at infinity at the telephoto end. In addition, about the description method of FIG. 19A-FIG. 19C, it is the same as that of the case shown to FIG. 4A-FIG. 4C.

  20A to 20C show lateral aberration diagrams at the infinity in-focus position at the time of image shake correction of the zoom lens of Example 6. FIG. 20A is a lateral aberration diagram at the wide-angle end in the zoom lens according to Example 6. FIG. 20B is a transverse aberration diagram at an intermediate focal length in the zoom lens of Example 6. FIG. 20C is a lateral aberration diagram at the telephoto end in the zoom lens of Example 6. 20A to 20C are the same as those shown in FIGS. 5A to 5C.

  The zoom lens of Example 6 satisfies the conditions of the present invention as shown in Tables 6A to 6D. And as for the zoom lens of Example 6, it turns out that each aberration is correct | amended favorably as shown to FIG. 19A-FIG. 19C and FIG. 20A-FIG. 20C.

  G1 ... 1st lens group G2 ... 2nd lens group G2A ... 2A lens part group G2B ... 2B lens part group G3 ... 3rd lens group G4 ... 4th lens group G5 ... 5th lens group L1-L3 ... 1st Lens constituting lens group L4 ... Lens constituting second A lens part group L5, L6 ... Lens constituting second B lens part group L7 ... Lens constituting third lens group L8 ... Lens constituting fourth lens group L9 ... Lens constituting the fifth lens group SP ... Aperture stop G ... Optical block IP ... Image plane 100 ... Mirrorless interchangeable-lens camera (imaging device) 101 ... Interchangeable lens (zoom lens) 102 ... Camera body 103 ... Solid-state imaging device

Claims (9)

In order from the object side, a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, a third lens group having a negative refractive power as a whole, and a negative as a whole A fourth lens group having a refractive power of
During zooming from the wide-angle end to the telephoto end, the air gap between the first lens group and the second lens group becomes small, the air gap between the second lens group and the third lens group becomes large, and The air gap between the third lens group and the fourth lens group changes,
A zoom lens, wherein image blur is corrected by moving at least a part of lenses constituting the third lens group or the fourth lens group in a plane intersecting an optical axis. A fifth lens group having positive refractive power as a whole on the image plane side of the fourth lens group;
During zooming from the wide-angle end to the telephoto end, the air space between the fourth lens group and the fifth lens group becomes large,
The combined focal length of said fifth lens group and f _5, a focal length of the entire system at the wide-angle end when the f _w,
1.5 <f ₅ / f _w <9.5
The zoom lens according to claim 1, wherein the following relationship is satisfied. In the case of correcting image blur by moving at least some of the lenses constituting the third lens group within a plane intersecting the optical axis,
The combined focal length of the third lens group and f _3, the focal length of the entire system at the telephoto end when a f _t,
0.2 <| f ₃ | / f _t <1.0
The zoom lens according to claim 1, wherein the zoom lens satisfies the following relationship. In the case of correcting image blur by moving at least a part of the lenses constituting the fourth lens group in a plane intersecting the optical axis,
The combined focal length of the fourth lens group and f _4, a focal length of the entire system at the telephoto end when a f _t,
0.5 <| f ₄ | / f _t <2.0
The zoom lens according to claim 1, wherein the zoom lens satisfies the following relationship.   5. The zoom lens according to claim 1, wherein the first lens group includes an aspheric lens whose negative refractive power decreases as the distance from the optical axis increases.   The lens group that corrects at least the image blur among the third lens group and the fourth lens group is composed of a single lens. Zoom lens described in 1. The composite focal length of the first lens group and f _1, the synthetic focal length of the second lens group and f _2, a focal length of the entire system at the wide angle end and f _w, the focal length of the entire system at the telephoto end When f _t
0.5 <| f ₁ | / f _w <2.0,
0.1 <f ₂ / f _t <0.5
The zoom lens according to claim 1, wherein the zoom lens satisfies the following relationship.   When correcting image blur by moving at least a part of the lenses constituting the fourth lens group in a plane intersecting the optical axis, by moving the third lens group in the optical axis direction, The zoom lens according to claim 1, wherein focusing is performed from an object at infinity to an object at a short distance. The zoom lens according to any one of claims 1 to 8,
An image pickup apparatus comprising: a solid-state image pickup device that picks up an image formed by the zoom lens.

Images