Patent ID: 7277232
Filing Date: 2007-10-02
Classification: G02B

Abstract:
1. A zoom lens system comprising, in order from an object: a first lens group having negative refractive power; and a second lens group having positive refractive power; zooming being carried out by varying an air space between the first lens group and the second lens group; the first lens group including in order, from the object, a negative lens, and a positive lens; the second lens group including, in order from the object, a front lens group having positive refractive power and a rear lens group having positive refractive power; the front lens group including, in order from the object, a positive lens and a cemented lens constructed by a positive lens cemented with a negative lens; the rear lens group including, in order from the object, a cemented lens constructed by a negative lens cemented with a positive lens; and the following conditional expression being satisfied: where Ds denotes an air space along the optical axis between the most image side lens surface of the front lens group and the most object side lens surface of the rear lens group, and D denotes a distance along the optical axis between the most object side lens surface and the most image side lens surface of the second lens group.