Wide angle to long focus zoom lens

Details Wide angle to long focus zoom lens Wide angle to long focus zoom lens

1979-09-05

1981-11-10

Corbin, John K.

350450, G02B 1518

Patent

active

042994543

ABSTRACT:
A zoom lens of the type having equivalent focal lengths varying from substantially less than the diagonal of its image frame to an equivalent focal length at least twice the diagonal of the image frame and having a short front vertex distance. The zoom range may be as great as 5:1, with a field angle in excess of 70 degrees at the widest field position.

REFERENCES:
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patent: 3884555 (1975-05-01), Suwa et al.
patent: 3918797 (1975-11-01), Takano
patent: 3918798 (1975-11-01), Takano
patent: 3918798 (1975-11-01), Takano
patent: 3937562 (1976-02-01), Muszumanski
patent: 3961845 (1976-06-01), Doi et al.
patent: 4017161 (1977-04-01), Tsuji
patent: 4141636 (1979-02-01), Shimojima
patent: 4192577 (1980-03-01), Ogino

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