Objective lens assembly of variable focal length having a diaphr

Details Objective lens assembly of variable focal length having a diaphr Objective lens assembly of variable focal length having a diaphr

1983-06-08

1985-06-25

Henry, Jon W.

350429, G02B 908, G02B 710

Patent

active

045250375

ABSTRACT:
A zoom lens assembly for use with a photographic camera having a capability of functioning two different modes one at a time. In one mode, the lens assembly is of a type having its aperture ratio variable with change in focal length, and in the other mode, it is of a type wherein change in aperture ratio resulting from the change in focal length is compensated for to give a uniform aperture ratio at all focal length settings. For this purpose, a unique change-over mechanism is built in the lens assembly for switching the lens assembly from one of the different modes onto the other of the different modes at the will of a photographer.

REFERENCES:
patent: 4141636 (1979-02-01), Shimojima
patent: 4159864 (1979-07-01), Yasukuni et al.
patent: 4258996 (1981-03-01), Uesugi et al.
patent: 4273414 (1981-06-01), Shimojima
patent: 4334746 (1982-06-01), Nazawa et al.
"Modern Tests" in Modern Photography, Nov. 1977, pp. 164-168.

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