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mi·cro·prism | \ ˈmī-krə-ˌpri-zəm 
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\Definition of microprism
: a usually circular area on the focusing screen of a camera that is made up of tiny prisms and that causes the image in the viewfinder to blur if the subject is not in focus
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Time Traveler for microprism
The first known use of microprism was in 1962
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