Zoom lens system

Details Zoom lens system Zoom lens system

2007-10-02

2007-10-02

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S685000, C359S691000

Reexamination Certificate

active

11200158

ABSTRACT:
An object is to provide a zoom lens system having compactness of about a normal lens, small number of lens elements, a zoom ratio about 2.9, good productivity, and high optical performance. The system includes, in order from the object, a first lens group with negative power and a second lens group with positive power. Zooming is performed by varying a distance between the first lens group and the second lens group. The first lens group includes at least a negative lens and a positive lens. The second lens group includes a front lens group with positive power and a rear lens group with positive power. The front lens group includes a positive lens and a cemented lens constructed by a positive lens cemented with a negative lens. The rear lens group includes a cemented lens constructed by a negative lens cemented with a positive lens. Given conditions are satisfied.

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