Fast aspherical zoom lens system

Details Fast aspherical zoom lens system Fast aspherical zoom lens system

1997-08-07

1998-09-29

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359708, G02B 1514, G02B 1318

Patent

active

058153233

ABSTRACT:
A fast aspherical zoom lens system includes a positive first lens group, a negative second lens group, a negative third lens group, and a positive fourth lens group, arranged in this order from the object side. The lens system includes at least one aspherical surface. When the zooming operation is carried out, the second and third lens groups are moved. The aspherical surface is located at a position in which the following condition is satisfied:

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