Patent ID: 8462441

Claim:
A zoom lens comprising, in order from an object side: a first lens group with positive power; a second lens group with negative power, moving for varying power of the zoom lens; a third lens group with positive power, disposed statinarily; and a fourth lens group with positive power, moving for correcting a position change of an image plane caused when the power of the zoom lens is varied, wherein the first lens group comprises, in order from the object side, a negative eleventh lens, a positive twelfth lens and a positive thirteenth lens, the second lens group consists of, in order from the object side, a negative twenty-first lens, a negative twenty-second lens, a positive twenty-third lens and a negative twenty-fourth lens, the third lens group comprises, in order from the object side, a positive thirty-first lens, a positive thirty-second lens and a negative thirty-third lens, the fourth lens group consists of a positive forty-first lens including one or more aspheric surfaces, and the zoom lens satisfies the following conditional expressions: −1.8 <f 2 /fw<− 0.9, 2.9 <f 34 /fw< 3.5, 75.0<ν1, where f2 is a focal length of the second lens group, f34 is a composite focal length of the third lens group and the fourth lens group at a wide-angle end, fw is a focal length of the zoom lens at the wide-angle end, and ν1 is an Abbe number of at least one positive lens forming the first lens group.