Wide angle zoom lens with high zoom ratio

Details Wide angle zoom lens with high zoom ratio Wide angle zoom lens with high zoom ratio

1978-04-07

1980-02-26

Clark, Conrad J.

G02B 1516

Patent

active

041903234

ABSTRACT:
A two lens group type of miniaturized zoom lens system having a minimum wide end viewing angle of 76.degree. and a zoom ratio at least 2.3. The first or object side lens group includes at least two positive and two negative lenses with the image side lens being positive. The second or image side lens group includes at least two positive lenses facing the object. The variable aperture is mounted in front of the second lens group and the fixed aperture, which may be proportionally movable, is mounted behind the second lens group. The overall lens system satisfies the following conditions: ##EQU1## wherein: Z is the zoom ratio (Z=f.sub.T /f.sub.W),

REFERENCES:
patent: 4142779 (1979-03-01), Ogawa

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