Zoom lens system

Details Zoom lens system Zoom lens system

2005-12-13

2005-12-13

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000

Reexamination Certificate

active

06975461

ABSTRACT:
A zoom lens system includes a movable positive first lens group, a movable negative second lens group, a movable positive third lens group, and movable stationary or positive fourth lens group. Upon zooming, the distance between the first and second lens groups is increased; the distance between the second and the third lens groups is decreased; and the distance between the third and the fourth lens groups is increased.

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