Zoom lens

Details Zoom lens Zoom lens

1984-04-05

1988-07-19

Corbin, John K.

G02B 1518

Patent

active

047580739

ABSTRACT:
A zoom lens having a range of equivalent focal lengths (EFL) which extend from a dimension above the diagonal of the film plane of the lens to a telephoto focal length, where the lens comprises three groups of which two are movable to vary the EFL.

REFERENCES:
patent: 4307943 (1981-12-01), Betensky et al.
patent: 4331389 (1982-05-01), Ogawa et al.
patent: 4462664 (1984-07-01), Moskovich
patent: 4504125 (1985-03-01), Fujii

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