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microprism
(redirected from microprisms)

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microprism [′mī·krə‚priz·əm]
(optics)
A usually circular area in the focusing screen of a camera viewfinder that is made up of tiny prisms and causes the image in the viewfinder to blur if the subject is out of focus.
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Pucker & Pout, a brush-on lip color, contains vitamins A, C and E, features SPF15 protection and contains color pigments and holographic microprisms that bend and wrap light around the contours of the wearer's lips.
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The split field prisms and microprisms of the focusing screen often go black because of the small maximum aperture and narrow angle included.
Telephoto lenses by Holden, T.T. / PSA Journal
The alternative strip uses glass beads instead of the microprisms and is less efficient.
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