1977-08-09
1979-08-28
Corbin, John K.
350 17, G05D 2500
Patent
active
041659198
ABSTRACT:
An adjustable solar filter assembly has two disc shaped relatively rotatable shields each having circumferentially spaced apart light passing openings separated by opaque portions. A filter element comprising an alumnized plastic sheet covers the openings in one of the shields. Relative rotation of the two discs changes the effective light passing area without changing the optical aperture provided by the filter to adjust for changing light conditions and/or to adjust the brightness of the viewed image. The filter assembly includes support and mounting members that enable the filter assembly to be mounted near the center of the exterior lens of the telescope.
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patent: 3982825 (1976-09-01), Mitchell
Corbin John K.
Koren Matthew W.
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