Zoom lens

Details Zoom lens Zoom lens

1981-02-17

1983-08-16

Corbin, John K.

G02B 1516

Patent

active

043988075

ABSTRACT:
An improvement in zoom lenses of the type consisting of four lens groups of positive, negative, positive, power positive and arranged in this order as viewed from the object side is disclosed. The improved zoom lenses exhibit excellent high focusing ability even for close distance photographing with higher magnification.

REFERENCES:
patent: 3615125 (1971-10-01), Higuchi et al.
patent: 4025167 (1977-05-01), Ikeda
patent: 4223981 (1980-09-01), Mizutani et al.

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