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

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micropotentiometer

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The first known use of microprism was in 1962

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