Zoom Lens

Details Zoom Lens Zoom Lens

1991-02-12

1992-05-05

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359685, G02B 1516, G02B 15177

Patent

active

051113384

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens unit of negative power, a seconde lens unit of positive power, a third lens unit of positive power and a fourth lens unit of negative power, wherein zooming from the wide-angle end to the telephoto end is performed by moving at least the second and fourth lens units toward the object side in such a way that the air separations between the first and second lens units and between the third and fourth lens units are shorter in the telephoto end than in the wide-angle end.

REFERENCES:
patent: 4702567 (1987-10-01), Kato et al.
patent: 4787718 (1988-11-01), Cho

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