Patent ID: 9007697
Filing Date: 2015-04-14
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, provided in this order from an object side; the distance between the first lens group and the second lens group changing when changing magnification; the first lens group comprising a first lens having a negative refractive power and a second lens, which is plastic, having a positive refractive power; and the zoom lens satisfying the following conditional formulae: wherein Nd1n is the refractive index of the first lens with respect to the d line, Nd1p and νd1p are the refractive index and the Abbe's number of the second lens with respect to the d line, respectively, d2 is the spatial distance between the first lens and the second lens along an optical axis, and fw is the focal length of the entire system at the wide angle end.