Patent ID: 8208205
Filing Date: 2012-06-26
Classification: G02B

Abstract:
1. A zoom lens comprising: a first lens group having a negative refractive power and a second lens group having a positive refractive power in order from an object side to an image side, wherein an interval between the first lens group and the second lens group is configured to be changed in a zoom operation, wherein the first lens group comprises a negative lens and a positive lens in order from the object side to the image side, wherein the negative lens and the positive lens of the first lens group are arranged at intervals, wherein the second lens group comprises a positive lens, a negative lens having a maximum refractive power, and a positive lens in order from the object side to the image side, wherein the positive lens that is arranged at a side closest to the image of the second lens group has a meniscus shape in which a concave surface faces the object side, and wherein the following conditional expressions are satisfied: where R1na is a radius of curvature of a lens surface at the object side of the negative lens of the first lens group, R2na is a radius of curvature of a lens surface at the object side of the negative lens having the maximum refractive power of the second lens group, R2nb is a radius of curvature of a lens surface at the image side of the negative lens having the maximum refractive power of the second lens group, f2 is a focal length of the second lens group, and fw is a focal length at a wide-angle end of the zoom lens.