Compact zoom lens

Details Compact zoom lens Compact zoom lens

1980-09-16

1983-04-19

Corbin, John K.

G02B 964, G02B 1518

Patent

active

043803776

ABSTRACT:
A compact zoom lens comprising, from front to rear, a positive 1st group movable for focusing consisting of a positive doublet of negative and positive lenses and a positive singlet, a negative 2nd group movable for variation of magnification consisting of a negative singlet and a negative doublet of negative and positive lenses, a positive 3rd group movable for image shift compensation simultaneously with the second group consisting of a positive doublet of positive and negative lenses, and a relay lens of positive power consisting of 4th and 5th groups, the fourth consisting of at least one positive lens of forward convexity and a negative lens, and the fifth consisting of a negative meniscus lens of rearward convexity and a positive lens, the zoom lens satisfying the following conditions:

REFERENCES:
patent: 4189213 (1980-02-01), Iizuka
patent: 4223981 (1980-09-01), Mizutani et al.
patent: 4240699 (1980-12-01), Sato et al.
patent: 4307943 (1981-12-01), Betensky et al.

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