Patent
1975-10-14
1976-12-21
Adams, Jr., Russell E.
354 50, 354 60R, 354 79, 354266, 354290, 350 19, G03B 700, G03B 1748
Patent
active
039991954
ABSTRACT:
An adjustable exposure control adapter for cameras is described which includes a light producing source, such as a LED, which is mountable in juxtaposition to a photo cell forming part of the automatic exposure system of the camera. A hand unit, connected to the light source, includes a battery, a potentiometer and a series of switches. One switch is connected to the photo release mechanism of the camera while another switch, when closed, permits maximum current to flow through the light source to produce the maximum brightness which almost instantaneously closes the shutter. Another switch, when closed and the potentiometer has been set to a predetermined value, causes a current to flow through the light source which is less than the maximum with corresponding less light being emitted by the source. The light produced by the light source, being the only source of light for the photo cell of the camera automatic exposure system, automatically results in the appropriate exposure time to correspond to the preselected potentiometer setting. The exposure control adapter is particularly useful for astro-photography as well as micro-photography and in instances where the ambient light conditions do not produce the desired exposure times when only the camera's automatic exposure system is used. In fact, the exposure control adapter regulates the operation of an internal automatic exposure system by regulating the amount of light which is presented at the automatic exposure system photo cell independently of the ambient light which may be present when the photograph is taken.
REFERENCES:
patent: 3292490 (1966-12-01), Moore
patent: 3690229 (1972-09-01), Kikuchi et al.
patent: 3798665 (1974-03-01), Eloranta et al.
patent: 3860936 (1975-01-01), Harvey
patent: 3898678 (1975-08-01), Walworth
patent: 3900858 (1975-08-01), McCann et al.
patent: 3911451 (1975-10-01), Vockenhuber
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