photog a code on a film cassette that automatically adjusts the film-speed setting on a suitably equipped camera to the correct ISO rating
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Word Origin for DX code
C20: from d(aylight) (e)x(posure)
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