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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“Microprism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/microprism. Accessed 3 Jul. 2022.
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Time Traveler for microprism
The first known use of microprism was in 1962
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