Zoom lens

Details Zoom lens Zoom lens

1982-09-28

1984-08-21

Corbin, John K.

G02B 1518

Patent

active

044667086

ABSTRACT:
A zoom lens which will continuous close focus to a magnification of 1:4, comprising three groups where the third group from the object end is stationary, the second group moves axially to vary the equivalent focal length, and the first group moves axially in predetermined relation to the second group to compensate for the variation in focal length, and is also independently movable axially to focus the lens.

REFERENCES:
patent: 3074317 (1963-01-01), Cox et al.
patent: 3840290 (1974-10-01), Betensky et al.
patent: 3975089 (1976-08-01), Betensky
patent: 4172635 (1979-10-01), Ogino
patent: 4303311 (1981-12-01), Nakamura
patent: 4306776 (1981-12-01), Someya
patent: 4307943 (1981-12-01), Betensky et al.

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