microprism


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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.
References in periodicals archive ?
In this regard, there have been numerous efforts to improve light efficiency of the BLU with different shapes of the microstructures of the LGP, such as etched dots (most widely used shape) (1), (6), micropyramids (2), microprisms (3), (4), continuous microlenses (5), convex microlens arrays (MLAs) (6), and so on.
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.
The alternative strip uses glass beads instead of the microprisms and is less efficient.