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reciprocity failure

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noun
photog a failure of the two exposure variables, light intensity and exposure time, to behave in a reciprocal fashion at very high or very low values
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

How to use reciprocity failure in a sentence

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