Dictionary

microprism

microprism

noun mi·cro·prism \ˈmī-krə-ˌpri-zəm\

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

First Known Use of MICROPRISM

1962

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