Camera accessories for contrast control

Details Camera accessories for contrast control Camera accessories for contrast control

1990-01-31

1990-12-18

Mathews, A. A.

Illumination

Supported by vehicle structure

Condition responsive

350315, 350318, 354126, 362 18, G03B 1100

Patent

active

049789864

ABSTRACT:
Camera accessories, mountable on lenses or flash units, for altering contrast between dark and light areas of photographs. A camera accessory includes framing plates for holding a polarized filter carrier which is rotatable in front of a camera lens or flash unit while a second polarized filter is linearly moveable over part or all of the front of the lens or flash unit. With the lens accessory, the second polarized filter can be positioned to cover one area of the picture while the first polarized filter and camera exposure controls are manipulated to alter lighting ratios. With a flash accessory, the two polarizers can be used as a variable density filter for increased flexibility in the use of flash photography to increase or decrease contrast between areas of highlights and shadows.

REFERENCES:
patent: 3994008 (1976-11-01), Land et al.
patent: 4302078 (1981-11-01), Stravitz
patent: 4687312 (1987-08-01), Navarro
patent: 4901098 (1990-02-01), Salles

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