Definition of microprism in English:

microprism

noun ˈmʌɪkrə(ʊ)ˌprɪz(ə)m

单词	microprism
释义	Definition of microprism in English: microprism noun ˈmʌɪkrə(ʊ)ˌprɪz(ə)m usually as modifier An area of the focusing screen of some reflex cameras which is covered with a grid of tiny prisms and splits up the image when the subject is not in focus. 微棱镜的 Example sentencesExamples This can be distinguished by the diamond-shaped lattice separating the sheeting layers, and a ‘coarse’ grain to the microprisms. Be careful to position your eye in the center of the finder to be able to see all the microprisms; some will black out if your eye is uncentered. An array of lenticular microlenses may be positioned to accept the output of the microprisms so that the light exiting from the microlenses is a substantially collimated light source. Although the array of microprisms used at Keck would probably be difficult to expand by large factors, we have shown in a series of laboratory measurements that commercially available microlenslet arrays are now of sufficient quality to constitute a viable substitute for microprisms. Plain screens are available without the central split-image and microprisms, and these are suitable for × 1 to about × 4.
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