Zoom lens, optical apparatus, and method for manufacturing the zoom lens

Abstract

A zoom lens includes a first lens group having negative refractive power; a second lens group having positive refractive power; a third lens group having negative refractive power and a fourth lens group having positive refractive power. Upon varying magnification, distances between the first lens group and the second lens group, between the second lens group and the third lens group and between the third lens group and the fourth lens group vary. The second lens group includes a front lens group, an aperture stop, and a rear lens group. Each of the front lens group and the rear lens group includes at least one positive lens. At least a part of the lenses in the second lens group is moved as a group to have a component in a direction perpendicular to an optical axis.

1 - 24 . (canceled) 
     
     
         25 . A zoom lens comprising, in order from an object side:
 a first lens group having negative refractive power; a second lens group having positive refractive power; a third lens group having negative refractive power and a fourth lens group having positive refractive power;   upon varying magnification, the first lens group, the second lens group and the third lens group being moved along an optical axis, and the position of the fourth lens group being fixed such that a distance between the first lens group and the second lens group, a distance between the second lens group and the third lens group and a distance between the third lens group and the fourth lens group are varied;   the first lens group consisting of, in order from the object side, a negative lens, a negative lens and a positive lens;   the second lens group being moved as a movable group to having a movement component in a direction perpendicular to the optical axis;   the third lens group consisting of one negative lens; and   upon focusing, the third lens group being moved along the optical axis.   
     
     
         26 . A zoom lens according to  claim 25 , wherein the following conditional expression is satisfied:
   1.00<| f 2 vr|/fw< 4.00   where f2vr denotes a focal length of the movable group; and fw denotes a focal length of the zoom lens in a wide angle end state.   
     
     
         27 . A zoom lens according to  claim 25 , wherein the following conditional expression is satisfied:
   0.50<| f 2 vr|/f 2<5.00   where f2vr denotes a focal length of the movable group; and f2 denotes a focal length of the second lens group.   
     
     
         28 . A zoom lens according to  claim 25 , wherein the following conditional expression is satisfied:
   1.00< m 12/ fw< 2.00   where m12 denotes an amount of variation in a distance along the optical axis from a most image side lens surface in the first lens group to a most object side lens surface in the second lens group upon varying magnification from a wide angle end state to a telephoto end state, and fw denotes a focal length of the zoom lens in the wide angle end state.   
     
     
         29 . A zoom lens according to  claim 25 , wherein the following conditional expression is satisfied:
   0.50< m 3/ fw< 0.80   where m3 denotes an amount of movement of the third lens group upon varying magnification from a wide angle end state to a telephoto end state; and fw denotes a focal length of the zoom lens in the wide angle end state.   
     
     
         30 . A zoom lens according to  claim 25 , wherein the following conditional expression is satisfied:
   1.50<(− f 3)/ fw< 4.00
   where f3 denotes a focal length of the third lens group; and fw denotes a focal length of the zoom lens in a wide angle end state.   
     
     
         31 . A zoom lens according to  claim 25 , wherein the second lens group includes, in order from a most object side, one lens component and an aperture stop. 
     
     
         32 . A zoom lens according to  claim 25 , wherein the fourth lens group consists of one positive lens. 
     
     
         33 . An optical apparatus equipped with the zoom lens according to  claim 25 . 
     
     
         34 . A method for manufacturing a zoom lens comprising, in order from an object side: a first lens group having negative refractive power; a second lens group having positive refractive power; a third lens group having negative refractive power and a fourth lens group having positive refractive power, the method comprising the steps of:
 disposing the lens groups such that, upon varying magnification, a distance between the first lens group and the second lens group, a distance between the second lens group and the third lens group and a distance between the third lens group and the fourth lens group are varied and a position of the lens group disposed at a most image side is fixed, the first lens group, the second lens group and the third lens group are moved along an optical axis, and a position of the fourth lens group is fixed;   configuring the first lens group to consist of, in order from a most object side, a negative lens, a negative lens and a positive lens;   disposing the second lens group to be moved as a movable group having a movement component in a direction perpendicular to the optical axis;   configuring the third lens group to consist of one negative lens; and   disposing the third lens group to be moved along the optical axis upon focusing.