Definitions for Apertureˈæp ər tʃər

This page provides all possible meanings and translations of the word Aperture

Random House Webster's College Dictionary

ap•er•tureˈæp ər tʃər(n.)

  1. an opening, as a hole, slit, or gap.

  2. Also called ap′erture stop`. an opening, usu. circular, that limits the quantity of light that can enter an optical instrument, as the lens of a camera.

    Category: Optics

Origin of aperture:

1400–50; late ME < L apertūra=apert(us), ptp. of aperīre to open (see aperient ) +-ūra -ure

ap′er•tured(adj.)

Princeton's WordNet

  1. aperture(noun)

    a device that controls amount of light admitted

  2. aperture(noun)

    a natural opening in something

  3. aperture(noun)

    an man-made opening; usually small

Wiktionary

  1. aperture(Noun)

    An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.

  2. aperture(Noun)

    Something which restricts the diameter of the light path through one plane in an optical system.

  3. aperture(Noun)

    The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens. e.g. a telescope may have a 100cm aperture.

  4. aperture(Noun)

    The maximum angle between the two generatrices.

    If the generatrix makes an angle u03B8 to the axis, then the aperture is 2u03B8.

  5. Origin: apertura, from apertus, past participle of aperire, opposed to operire. See aperient.

Webster Dictionary

  1. Aperture(noun)

    the act of opening

  2. Aperture(noun)

    an opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall

  3. Aperture(noun)

    the diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture

Freebase

  1. Aperture

    In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are, which is of great importance for the appearance at the image plane. If an aperture is narrow, then highly collimated rays are admitted, resulting in a sharp focus at the image plane. If an aperture is wide, then uncollimated rays are admitted, resulting in a sharp focus only for rays with a certain focal length. This means that a wide aperture results in an image that is sharp around what the lens is focusing on and blurred otherwise. The aperture also determines how many of the incoming rays are actually admitted and thus how much light reaches the image plane. An optical system typically has many openings, or structures that limit the ray bundles. These structures may be the edge of a lens or mirror, or a ring or other fixture that holds an optical element in place, or may be a special element such as a diaphragm placed in the optical path to limit the light admitted by the system. In general, these structures are called stops, and the aperture stop is the stop that determines the ray cone angle, or equivalently the brightness, at an image point.


Translations for Aperture

Kernerman English Multilingual Dictionary

aperture(noun)

an opening or hole.

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