Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1985-04-12

1987-01-06

Griffin, Donald A.

G02B 1500

Patent

active

046342508

ABSTRACT:
A zoom lens barrel of the type in which an open F-value which is not maintained constant during a zooming operation by the original optical design, is caused to maintain an open F-value constant during a zooming operation, by the application of a diaphragm correction which is effected through a mechanical change in the diaphragm aperture. The diaphragm correction which is applied to maintain the open F-value constant is terminated when a diaphragm ring is set to an open F-value on the wide angle side or to a programmed mode position.

REFERENCES:
patent: 3906529 (1975-09-01), Filipovich
patent: 3918797 (1975-11-01), Takano
patent: 4141636 (1979-02-01), Shimojima

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