CC filter

Definition: Colour-correction (or colour compensating) filter: accessory made of transparent, coloured material used to make small changes to colour balance of light entering camera. * Materials used: gelatin, glass, resin or plastics; colours available: either primaries -- red, blue, green -- or secondaries -- cyan, magenta or yellow. Available in densities varying from 0.025 to 0.50 or more, measured for the colour absorbed. * Designated by density and colour e.g. CC025M is magenta of 0.025 density; CC50Y is yellow of 0.5 density. * Enlargers for making colour prints may have built-in colour correction filters, often with manufacturer's own idea of calibration.

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