Definition of reciprocity failure in English:

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reciprocity failure

noun

Photography
Failure of an emulsion to follow the principle that the degree of darkening is constant for a given product of light intensity and exposure time, typically at very low or very high light intensities.
Example sentences
  • The next fact is that you also do not need to know anything about shutter speeds, zoom lenses, reciprocity failure or the like.
  • Now if you have read about time exposures you will have come across the phrase ‘reciprocity failure’ with long time exposures.
  • Those of you who have read books and magazines will have read about ‘reciprocity failure’ with long time exposures.

For editors and proofreaders

Syllabification: rec·i·proc·i·ty fail·ure

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