Patent ID: 7206138

Claim:
A zoom lens system, comprising, in order from an object side thereof, a first lens group that is located nearest to the object side and has negative refracting power, a second lens group of positive refracting power and a third lens group of positive refracting power, in which zooming is carried out by each movement of the first, the second, and the third lens group with a change in each space between adjacent lens groups, wherein: said second lens group comprises three lenses inclusive of, in order from an object side thereof, a first lens of positive refracting power, a second lens of positive refracting power and a third lens of negative refracting power, and a total of the lenses in the second lens group is 3, and said third lens group comprises a positive lens that is of meniscus shape convex toward an image plane of the zoom lens system and satisfies the following condition (3-1), and a total of the lenses in the third lens group is 1: 1.44<n≦1.53 (3-1) where n is a refractive index of the positive lens in the third lens group.