High range zoom lens

Details High range zoom lens High range zoom lens

1984-10-04

1987-01-27

Corbin, John K.

G02B 1514

Patent

active

046390960

ABSTRACT:
The disclosed zoom lens is composed of four lens groups. Counting from the front, the first lens group has a positive power, the second a negative power, the third a positive power and the fourth a positive or a negative power. At least the first, third and fourth lens groups are movable for zooming. The zoom lens satisfies the following conditions:

REFERENCES:
patent: 4359270 (1982-11-01), Okudaira
patent: 4437732 (1984-03-01), Ishiyama

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