Photographic color copying apparatus and exposure control...

Details Photographic color copying apparatus and exposure control... Photographic color copying apparatus and exposure control...

G - Physics

03

B

95/25

G03B 27/00 (2006.01) G03B 27/73 (2006.01)

Patent

CA 2026349

A photographic color copying apparatus and an exposure control process includes measuring filters variable as a function of the spectral sensitivities of different copy materials, in particular electro-optical filters. The variable measuring filters are constructed in the manner of Solo filters or Lyot-Ohman filters and include polarizers and electro-optical crystals, preferably liquid crystals,

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