Patent ID: 7889440

Claim:
A zoom lens comprising, in order from an object side: a first lens group having positive refractive power; a second lens group having negative refractive power; and a rear lens group having positive refractive power; the second lens group including at least one positive lens and a negative lens disposed adjacent to the object side of the positive lens having largest refractive power among the positive lenses, upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group varying, and a distance between the second lens group and the rear lens group varying, and the following conditional expressions being satisfied: 0.80<( r 2+ r 1)/( r 2− r 1)<3.50 0.50<(− f 2)/ fw< 0.90 where r 1 denotes a radius of curvature of the object side lens surface of the negative lens in the second lens group, r 2 denotes a radius of curvature of the image side lens surface of the negative lens in the second lens group, fw denotes a focal length of the zoom lens in the wide-angle end state, and f 2 denotes a focal length of the second lens group.