iris diaphragm

noun
diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
Syn: ↑iris
Hypernyms: ↑diaphragm, ↑stop

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noun
: an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usually to regulate the aperture of a lens (as in a camera or microscope)

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Optics, Photog.
a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system. Also called iris.
[1885-90]

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iris diaphragm noun
An adjustable stop for a lens, giving a continuously variable hole
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Main Entry:iris

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iris diaphragm,
Optics. a diaphragm made of thin opaque plates, in which the size of the aperture can be varied by turning a ring attached to the plates. It is used to regulate the light admitted to a camera.

Useful english dictionary. 2012.

Look at other dictionaries:

  • Iris diaphragm — I ris di a*phragm An adjustable diaphragm, reminiscent of the iris of the eye in its action, by which the diameter of an approximately circular opening may be controlled, as for regulating the aperture of a lens; it consists of a number of… …   The Collaborative International Dictionary of English

  • iris diaphragm — n an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usu. to regulate the aperture of a lens (as in a microscope) …   Medical dictionary

  • iris diaphragm — n. a device consisting of thin, overlapping metal blades that can be adjusted to form an aperture of varying size for camera lenses, etc.: see MICROSCOPE …   English World dictionary

  • iris diaphragm — vyzdinė diafragma statusas T sritis fizika atitikmenys: angl. iris diaphragm vok. Irisblende, f rus. ирисовая диафрагма, f pranc. diaphragme iris, m …   Fizikos terminų žodynas

  • iris diaphragm — Optics, Photog. a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system. Also called iris. [1885 90] * * * …   Universalium

  • iris diaphragm — /ˈaɪrəs daɪəfræm/ (say uyruhs duyuhfram) noun a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system. Also, iris …   Australian English dictionary

  • Iris (diaphragm) — An iris is a mechanism that is used as a compact solution to close and open holes. Iris mechanisms are commonly found in optical shutters (diaphragms), and also in various kinds of valves. Irises are sometimes used in science fiction as doors. ee …   Wikipedia

  • iris diaphragm — noun Date: 1867 an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usually to regulate the aperture of a lens …   New Collegiate Dictionary

  • iris diaphragm — i′ris di aphragm n. opt pht a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system • Etymology: 1885–90 …   From formal English to slang

  • Iris diaphragm — Ирисовая диафрагма …   Краткий толковый словарь по полиграфии

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