microprismn.

Brit.

/ˈmʌɪkrə(ʊ)ˌprɪz(ə)m/, U.S.

/ˈmaɪkroʊˌprɪz(ə)m/

Origin: Formed within English, by compounding. Etymons: micro- comb. form, prism n.

Etymology: < micro- comb. form + prism n.

1. A tiny prism; esp. a tiny prismatic crystal.

ΚΠ

1936 Amer. Naturalist 70 479 In certain instances, the same compounds may, by virtue of a definite crystalline habit, act as scintillating microprisms.

1944 Proc. Royal Soc. B. 132 130 The picrate, yellow micro-prisms from benzene-ethyl acetate.

1960 Proc. Royal Soc. B. 152 233 This gave 0·5 g pale yellow microprisms.

1962 Science 9 Nov. 740/1 (advt.) Prism holder and micro-prism.

1991 Better Roads Nov. 32/1 A roll-up sign consists of a layer of vinyl microprism reflective sheeting.

2. Photography. A tiny prism forming part of the focusing system of some reflex cameras. Also: an area of the focusing screen of some reflex cameras which is covered with a grid of tiny prisms and which splits up and blurs the image when the subject is not in focus (usually attributive).

ΘΚΠ

society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [noun] > focusing screen or system

screen1847

autofocusing1923

autofocus1958

microprism1962

1962 Mod. Photogr. Sept. 76 Honeywell Pentax... Life-size, full focusing,..central microprism.

1966 H. Keppler Asahi Pentax Way 319 In using the central microprism grid for focusing, you will find that it snaps images in and out of focus with medium focal length lenses more efficiently than with either wide-angle or extremely long lenses.

1973 Country Life 20 Sept. 826/1 (advt.) Microprism focusing means speedy and accurate focusing.

1987 Amateur Photographer 22 Aug. 30/1 Viewfinder... Focusing screen: Matt screen with microprism collar.

1990 Amateur Photographer 22 Sept. 54/2 The camera must be held horizontally and focusing gauged by looking at the matt surround, as a central microprism or a split-image finder will not work.

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).

单词	microprism
释义	microprismn. Brit. /ˈmʌɪkrə(ʊ)ˌprɪz(ə)m/, U.S. /ˈmaɪkroʊˌprɪz(ə)m/ Origin: Formed within English, by compounding. Etymons: micro- comb. form, prism n. Etymology: < micro- comb. form + prism n. 1. A tiny prism; esp. a tiny prismatic crystal. ΚΠ 1936 Amer. Naturalist 70 479 In certain instances, the same compounds may, by virtue of a definite crystalline habit, act as scintillating microprisms. 1944 Proc. Royal Soc. B. 132 130 The picrate, yellow micro-prisms from benzene-ethyl acetate. 1960 Proc. Royal Soc. B. 152 233 This gave 0·5 g pale yellow microprisms. 1962 Science 9 Nov. 740/1 (advt.) Prism holder and micro-prism. 1991 Better Roads Nov. 32/1 A roll-up sign consists of a layer of vinyl microprism reflective sheeting. 2. Photography. A tiny prism forming part of the focusing system of some reflex cameras. Also: an area of the focusing screen of some reflex cameras which is covered with a grid of tiny prisms and which splits up and blurs the image when the subject is not in focus (usually attributive). ΘΚΠ society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [noun] > focusing screen or system screen1847 autofocusing1923 autofocus1958 microprism1962 1962 Mod. Photogr. Sept. 76 Honeywell Pentax... Life-size, full focusing,..central microprism. 1966 H. Keppler Asahi Pentax Way 319 In using the central microprism grid for focusing, you will find that it snaps images in and out of focus with medium focal length lenses more efficiently than with either wide-angle or extremely long lenses. 1973 Country Life 20 Sept. 826/1 (advt.) Microprism focusing means speedy and accurate focusing. 1987 Amateur Photographer 22 Aug. 30/1 Viewfinder... Focusing screen: Matt screen with microprism collar. 1990 Amateur Photographer 22 Sept. 54/2 The camera must be held horizontally and focusing gauged by looking at the matt surround, as a central microprism or a split-image finder will not work. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1936
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