Programmed shutter and apparatus for preventing foreign matter o

Details Programmed shutter and apparatus for preventing foreign matter o Programmed shutter and apparatus for preventing foreign matter o

1987-12-08

1988-12-27

Adams, Russell E.

3541951, 35419511, 354483, G03B 7089, G03B 1100

Patent

active

047944188

ABSTRACT:
A programmed shutter and an apparatus are provided for preventing material, such as dust, on camera lenses from being photographed. The shutter can be used alone, or can be used together with a pivotable neutral density filter which can be selectively positioned along the optical axis of a lens system having a zoom lens or at least two focal length positions.

REFERENCES:
patent: 3035489 (1962-05-01), Simons
patent: 3918798 (1975-11-01), Takano
patent: 3978497 (1976-08-01), Kondo
patent: 3987461 (1976-10-01), Kondo
patent: 4123764 (1978-10-01), Uno et al.
patent: 4203661 (1980-05-01), Besenmatter
patent: 4269490 (1981-05-01), Takami
patent: 4345825 (1982-08-01), Matteson et al.
patent: 4473281 (1984-09-01), Hama

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