ZOOM LENS SYSTEM

摘要

A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, and a positive fifth lens group, in that order from the object side. Upon zooming from the short to long focal length extremities, at least the first, third and fifth lens groups move in the optical axis direction. The second lens group includes at least four lens elements. Each of the third, fourth and fifth lens groups includes a plurality of lens elements. The following conditions (1) and (2) are satisfied:;1.60

主权项

1. A zoom lens system comprising a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, and a positive fifth lens group, in that order from the object side,
wherein upon zooming from the short focal length extremity to the long focal length extremity, at least said first lens group, said third lens group and said fifth lens group move in the optical axis direction, wherein said second lens group includes at least four lens elements, wherein said third lens group includes a plurality of lens elements, wherein said fourth lens group includes a plurality of lens elements, wherein said fifth lens group includes a plurality of lens elements, and wherein the following conditions (1) and (2) are satisfied:
1.60