filter factor

filter factor
: a number by which the normal exposure time must be multiplied to compensate for the use of a color filter with a given photographic material and source of illumination

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a number indicating the increased exposure that a particular film should receive when a photograph is taken using a particular filter.

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filter factor,
the amount of time by which a photographic exposure must be increased when a given filter is used.

Useful english dictionary. 2012.

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