Zoom lens barrel capable of close up photography

Details Zoom lens barrel capable of close up photography Zoom lens barrel capable of close up photography

1981-10-02

1984-06-26

Corbin, John K.

G02B 1518

Patent

active

044563426

ABSTRACT:
A zoom lens barrel has a focusing operating member and a zooming operating member and a blocking member. When the blocking member is at a first position, movement of the focusing operating member is blocked so as to prevent focusing of a lens system with respect to an object at a distance shorter than a predetermined distance, and when the blocking member is at a second position, movement of the zooming operating member is blocked so as to prevent zooming outside of a predetermined focal length range of the lens system.

REFERENCES:
patent: 3970368 (1976-07-01), Von Belvard
patent: 4101202 (1978-07-01), Tesch
patent: 4210387 (1980-07-01), Ogawa
patent: 4229074 (1980-10-01), Nonogaki

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