High range zoom lens

Details High range zoom lens High range zoom lens

1985-03-29

1987-09-22

Corbin, John K.

350423, G02B 1516

Patent

active

046951334

ABSTRACT:
The disclosed zoom lens includes, from front to rear, a first lens unit of positive power, a second lens unit of negative power, a third lens unit of positive power, and a fourth lens unit. When zooming, the first and third lens units are axially moved independently of each other, the second lens unit remains stationary, and the fourth lens unit is axially moved but changes the direction of advance at an intermediate point in the zooming range.

REFERENCES:
patent: 4494828 (1985-01-01), Masumoto et al.
patent: 4501475 (1985-02-01), Fujita et al.

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