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microprism

Focusing aid in a viewfinder screen composed of small glass or plastic multiple prisms. An image that is in focus appears sharp and clear. An out-of-focus image has a broken-up, shimmery appearance. It s called a collar because it is ring-shaped and encircles the center area of the lens (which may have a split-image screen in it) like a collar.

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microprism

A focusing aid located in the focusing screen.
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