Exposure-equalizing system for photographic images

Details Exposure-equalizing system for photographic images Exposure-equalizing system for photographic images

1992-11-02

1994-10-04

Gellner, Michael L.

Optical: systems and elements

Prism

With reflecting surface

354432, 354454, 359241, G03B 7085, G03B 1912

Patent

active

053530802

ABSTRACT:
A transparent photochromic medium is placed before the film or film-equivalent of a camera or photographic imaging device such that a light exposure of the medium temporarily darkens it according to the different light values in the image. A subsequent exposure of the film is influenced by the intervening photochromic device so that the range of light is moderated, reducing over- and under-exposure of areas of the film.

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Smith, G. P. Photochromic Silver Halide Glasses, Corning Glass.

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