Zoom lens assembly with restrictable zooming range

Details Zoom lens assembly with restrictable zooming range Zoom lens assembly with restrictable zooming range

1977-03-30

1979-07-31

Henry, Jon W.

350255, G02B 710, G02B 1518

Patent

active

041628225

ABSTRACT:
A zoom lens assembly for photographic cameras, particularly for movie cameras, has a focussing ring, a zooming ring and a fixed-tube for supporting these rings as well as associated lenses. A locking device is provided for locking the focussing ring at the hyperfocal position and at the same time for restricting the zooming range to one in which a sharp image can be produced independently from the zooming operation with the focussing lens being set at the hyperfocal position.

REFERENCES:
patent: 3970368 (1976-07-01), Von Belvard

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