Zoom lens system having a high zoom ratio

Details Zoom lens system having a high zoom ratio Zoom lens system having a high zoom ratio

1996-08-23

1998-07-28

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

057869430

ABSTRACT:
First, second, third, and fourth lens groups, from an object side, have positive, negative, negative, and positive power, respectively. Movable second and third lens groups vary magnification and perform focus compensating. The fixed fourth lens group has an image forming function, and includes, from the object side, positive first and second lens sub-groups. The zoom lens satisfies the following relationships:

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