aperture

aperture
—apertural /ap"euhr choor'euhl/, adj. —apertured, adj.
/ap"euhr cheuhr/, n.
1. an opening, as a hole, slit, crack, gap, etc.
2. Also called aperture stop. Optics. an opening, usually circular, that limits the quantity of light that can enter an optical instrument.
[1400-50; late ME < L apertura an opening, equiv. to apert(us) opened (ptp. of aperire; aper(i)- (see APERIENT) + -tus ptp. suffix) + -ura -URE]

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▪ optics
      in optics, the maximum diameter of a light beam that can pass through an optical system. The size of an aperture is limited by the size of the mount holding the optical component, or the size of the diaphragm placed in the bundle of light rays. The hole in the mount or diaphragm that limits the size of the aperture is called an aperture stop. Thus, an aperture stop determines the amount of light that traverses an optical system and hence determines the image illumination.

      Closely related to the aperture stop is its image, called the entrance pupil of the optical system. The angle that the diameter of the entrance pupil subtends at an object point is called the angular aperture, which can be taken as a measure of the light-gathering power of the instrument. See also pupil; relative aperture.

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Universalium. 2010.

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  • aperture — [ apɛrtyr ] n. f. • 1916; « ouverture » archit. XVIe; lat. apertura, de aperire « ouvrir » ♦ Phonét. Écartement des organes au point d articulation d un phonème pendant la tenue. Degrés d aperture des voyelles. ● aperture nom féminin (latin… …   Encyclopédie Universelle

  • Aperture — Ap er*ture (?; 135), n. [L. apertura, fr. aperire. See {Aperient}.] 1. The act of opening. [Obs.] [1913 Webster] 2. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall. [1913 Webster] An… …   The Collaborative International Dictionary of English

  • Aperture — (BE: [ˈæpətʃə]; AmE: [ˈæpɚtʃʊɹ]) bezeichnet: Aperture (Software), eine Bildverwaltungssoftware Aperture (Softwarehersteller), einen Softwarehersteller Aperture (Zeitschrift), eine US amerikanische Fachzeitschrift für Fotografie Siehe auch:… …   Deutsch Wikipedia

  • aperture — aperture, interstice, orifice denote an opening allowing passage through or in and out. Aperture is applied especially to any opening in a thing that otherwise presents a solid or closed surface or structure; it may be applied both to an opening… …   New Dictionary of Synonyms

  • aperture — index loophole, outlet, portal, rift (gap), split Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • aperture — (n.) early 15c., from L. apertura an opening, from apertus, pp. of aperire to open (see OVERT (Cf. overt)) …   Etymology dictionary

  • aperture — [n] hole breach, break, chasm, chink, cleft, crack, cut, eye, fissure, gap, gash, interstice, opening, orifice, outlet, passage, perforation, pinhole, puncture, rift, rupture, slash, slit, slot, space, vent; concept 757 …   New thesaurus

  • aperture — ► NOUN 1) an opening, hole, or gap. 2) the variable opening by which light enters a camera. ORIGIN Latin apertura, from aperire to open …   English terms dictionary

  • aperture — [ap′ər chər] n. [L apertura < apertus, pp. of aperire, to open < IE * ap wer , to uncover < base * ap(o) away + * wer to close, cover > WARN] 1. an opening; hole; gap 2. the opening, or the diameter of the opening, in a camera,… …   English World dictionary

  • Aperture — For other uses, see Aperture (disambiguation). f stops demonstrated on a lens …   Wikipedia

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