Focus device for zoom lens

Details Focus device for zoom lens Focus device for zoom lens

1979-04-06

1980-07-01

Henry, Jon W.

350255, G02B 704, G02B 1518

Patent

active

042103878

ABSTRACT:
A focus device for a zoom lens having a mounting barrel focus member and a variator member. A stopper defines a short distance limit stop position. The stopper moves in cooperation with the variator member so that in a particular range of a focal distance of the zoom lens, the short distance photographing limit is advanced to allow extreme close-up photography.

REFERENCES:
patent: 3970368 (1976-06-01), Von Belvard
patent: 4110005 (1978-08-01), Bohm et al.

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