Compact standard zoom lens

Details Compact standard zoom lens Compact standard zoom lens

1979-06-04

1981-02-17

Clark, Conrad J.

G02B 1514

Patent

active

042511321

ABSTRACT:
A compact standard zoom lens having a high performance, composed, in order from the object side, of a front lens group being a divergent lens group and a rear lens group being a convergent lens group. Both lens groups are mechanically movable to vary the focal length. The divergent lens group is composed, in order from the object side, of a first positive lens, a second double concave negative lens and a third positive meniscus lens convex on the object side. The convergent lens group is composed of less than five positive lenses and one negative lens. The zoom lens satisfies the following conditions:

REFERENCES:
patent: 4198128 (1980-04-01), Ogino

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