aperture

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Related to Aperature: Depth of field, 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 periodicals archive ?
5 pounds (without tripod) Feed system: 250-round fabric belt Sights: Front-- hooded blade Rear-- aperature adjustable by leaf from 200 to 2000 meters Rate of fire: 450 rpm Specifications: Pistoolmiltrailleur M.
The ProPak-LBplus is powered by NovAtel's OEM4-G2 receiver - a small, high performance, dual frequency GPS engine featuring patented Pulse Aperature Correlator (PAC) multipath reduction technology.
F Abas, "A multistatic circular synthethic aperature radar for small object detection," IEEE Radar Conference, 262-266, Kansas City, MO, USA, May 2011.
Nevertheless, we reported earlier that very thin optical sections can be obtained in DIC, polarization, and phase contrast microscopy in the absence of confocal imaging by using well-corrected optics of high numerical aperature (NA) and video and digital contrast enhancement (3).
Among the mission systems displayed on the EADS North America AAAA exhibit are the HELLAS obstacle avoidance and cable warning system for helicopters, the MiSAR miniature all-weather synthetic aperature radar for helicopters and tactical unmanned aerial vehicles, and the Mini-FLITS (minimized front-line integrated test system) from Racal Instruments, a Test and Services business unit of EADS North America Defense.
The OEM4 card is a small, high performance, dual frequency receiver featuring patented Pulse Aperature Correlator (PAC) technology.
For example, engineering services can enter figures for labor, aperature card reproduction, storage and distribution.