Wide angle zoom lens system having shortened closeup focal lengt

Details Wide angle zoom lens system having shortened closeup focal lengt Wide angle zoom lens system having shortened closeup focal lengt

1979-08-30

1981-05-12

Clark, Conrad J.

G02B 1516

Patent

active

042668603

ABSTRACT:
A wide angle zoom lens system capable of photographing objects from infinity to a close distance while maintaining an excellent image-forming performance employs a first group which is a divergent lens group having a focusing function, and a second group which is a convergent lens group disposed rearwardly of the first group. The first group includes a divergent forward portion and a convergent rearward portion disposed with a predetermined spacing from the forward portion, the forward and rearward portions being movable relative to one another for focusing. The first and second groups are movable relative to each other to effect a magnification change.

REFERENCES:
patent: 3992084 (1976-11-01), Nakamura
patent: 4099846 (1978-07-01), Kawamura et al.
patent: 4155629 (1979-05-01), Nakamura
patent: 4169660 (1979-10-01), Nakamura
patent: 4189212 (1980-02-01), Mizutani
patent: 4190323 (1980-02-01), Ogawa

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