Zoom lens system

Details Zoom lens system Zoom lens system

1977-05-27

1980-02-19

Clark, Conrad J.

G02B 1518

Patent

active

041892135

ABSTRACT:
A zoom lens system comprises, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group and a positive fifth lens group. The first lens group includes a positive lens component comprising a negative and a positive lens cemented together, and a positive meniscus lens component convex to the object side. The second lens group includes a negative lens component and a negative lens component comprising a negative lens and at least one positive lens cemented together. The third lens group includes at least one positive lens component and a positive lens component comprising a positive and a negative lens cemented together. The fourth lens group includes a negative lens component. The fifth lens group comprises a forward and a rearward group spaced apart a substantial distance from each other by an air space. The forward group includes a positive meniscus lens component convex to the object side, and the rearward group includes a negative meniscus lens component convex to the image side and a positive lens component.

REFERENCES:
patent: 3970367 (1976-07-01), Tsugi
patent: 3972591 (1976-08-01), Suwa

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