Patent ID: 6614599
Filing Date: 2003-09-02
Classification: G02B

Abstract:
A zoom lens system comprising, in order from an object side of said zoom lens system, a first lens group having negative power, an aperture stop, a second lens group having positive power and a third lens group having positive power, wherein:for zooming, said first lens group and said second lens group move on an optical axis with a varying spacing between adjacent lens groups while said third lens group remains fixed, during said zooming, said stop moves in unison with said second lens group, said first lens group consists of, in order from an object side thereof, a negative lens component, air, a negative meniscus lens component, air and a positive meniscus lens component, said third lens group consists of one lens element, and said second lens group consists of, in order from an object side thereof, a positive lens component, a cemented lens component consisting of a positive element and a negative element and a positive lens component, and the following condition (4) is satisfied: 0.43/ft<2.5â€ƒâ€ƒ(4) where f3 is a focal length of said third lens group and ft is a focal length of said zoom lens system at a telephoto end thereof.