microprism
/ (ˈmaɪkrəʊˌprɪzəm) /
noun
photog a small prism incorporated in the focusing screen of many single-lens reflex cameras. The prism stops shimmering when the subject is in focus
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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
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