Zoom lens system

Details Zoom lens system Zoom lens system

1996-07-23

1997-11-11

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359714, G02B 1514, G02B 1318

Patent

active

056870280

ABSTRACT:
A zoom lens system includes a positive first lens group and a negative second lens group in this order from an object side. A distance between the first and second lens groups is varied during a zooming operation. The first lens group consists of a negative first sub-group and a positive second sub-group, in this order from an object side. The negative first sub-group consisting of a negative first lens element, having a concave surface facing toward the object side, and a negative second lens element, having a concave surface that faces toward an image side, in this order from the object side. The negative first sub-group being provided with at least one aspherical surface. The zoom lens system satisfies the following relationships:

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patent: 5353162 (1994-10-01), Ito et al.
patent: 5412508 (1995-05-01), Lin
patent: 5424871 (1995-06-01), Ito et al.

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