aperture


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Related to aperture: Shutter speed

aperture

Physics
a. a usually circular and often variable opening in an optical instrument or device that controls the quantity of radiation entering or leaving it
b. the diameter of such an opening

aperture

The diameter of the unobscured portion of the objective lens in a refracting telescope or of the primary mirror in a reflector. In a radio telescope it is the physical size of the antenna. As the aperture is increased, the telescope gathers more light, radio waves, etc., and thus will discern fainter objects: the radiation-gathering power depends on area, i.e. on the square of the aperture. A larger aperture also produces a smaller Airy disk and so has greater spatial resolution.

Aperture

An opening for the purpose of admitting light.

aperture

[′ap·ə‚chər]
(electronics)
An opening through which electrons, light, radio waves, or other radiation can pass.
(graphic arts)
A rectangular cutout on an aperture card.
(optics)
The diameter of the objective of a telescope or other optical instrument, usually expressed in inches, but sometimes as the angle between lines from the principal focus to opposite ends of a diameter of the objective.

aperture

(1) An orifice. It often refers to an opening in which light is allowed to pass in optical systems such as cameras and lasers. See f-stop and numerical aperture.

(2) (Aperture) A photo editing and management application for the Mac from Apple. Introduced in 2005 and used by professional photographers, Aperture provides sophisticated touch-up tools and works with the iPhoto library. See iLife.
References in classic literature ?
The aperture was already sufficiently large for him to enter, but by waiting, he could still cling to hope, and retard the certainty of deception.
At more or less regular stages it was pierced by apertures closed by doors, none of which he could open until he had climbed fully fifty feet from the river level.
Sometimes they wore necklaces of small carnation flowers, strung like rubies upon a fibre of tappa, or displayed in their ears a single white bud, the stem thrust backward through the aperture, and showing in front the delicate petals folded together in a beautiful sphere, and looking like a drop of the purest pearl.
Thrust forward through the large apertures in his ears were two small and finely-shaped sperm whale teeth, presenting their cavities in front, stuffed with freshly-plucked leaves, and curiously wrought at the other end into strange little images and devices.
Ajor, having less knowledge of the effectiveness of firearms than I, and therefore greater confidence in them, entreated me to shoot the beast; but I knew that the chance that I could stop it with a single shot was most remote, while that I should but infuriate it was real and present; and so I waited for what seemed an eternity, watching those devilish points of fire glaring balefully at us, and listening to the ever-increasing volume of those seismic growls which seemed to rumble upward from the bowels of the earth, shaking the very cliffs beneath which we cowered, until at last I saw that the brute was again approaching the aperture.
Our fire was just within the cave, the smoke rising through the apertures between the rocks that I had piled in such a way that they arched inward toward the cliff at the top.
Smartphone cameras have an aperture which is a tiny hole that allows light into the image sensor.
Dual aperture in a lens is one of the most used and implemented aspects of interchangeable lens cameras.
The variable aperture is listed as capable of switching between f/1.
28 September 2017 - UK-based individual voluntary arrangements (IVA) Aperture Debt Solutions LLP, has acquired the debt free direct (DFD) segment of UK-based consumer professional services company Fairpoint Group plc, to strengthen Aperture's position in the market, the company said.
preform aperture ANSI LF f105 in an amount of 3 pieces .
66), as well as the aspect ratio influence as the geometric shape of the aperture moved from a square to a rectangle.