aperture

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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 ?
This last to the dead Wieroo as he stooped and dragged the corpse to the central shaft, where he raised it to the aperture and let it slip into the tube.
The aperture of the rock had been closed with stones, then this stucco had been applied, and painted to imitate granite.
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.
For a moment they breathed more freely, but presently they discovered that the aperture was continuing to enlarge.
That was, in fact, a marvellous grimace which was beaming at that moment through the aperture in the rose window.
Above him, through the aperture, Werper could see sunlight glancing from massive columns, which were twined about by clinging vines.
Smaller apertures on the other hand allows the camera to capture sharper images on well-lit environments.
The Apple iPhone 7 Plus, launched in 2016, was the first dual-camera module to come with two lenses that had different apertures - f/1.
8, the Cp values were noticeably higher than for those apertures with a 1.
Large apertures (antennas and telescopes) and long baselines and focal lengths in space have applications for telecommunications Earth observation and scientific missions.
We are combining energies from multiple apertures so electrically they look like one," Potter told National Defense.
In fact, we maintain that under most conditions, electroformed and nanocoated stencils aren't necessary at all, but rather a different way of thinking about stencil apertures and how to optimize their design to achieve best results with fine-pitch, given a few "rules" about the basics of area ratio and how it affects solder paste printing, no matter the stencil material or type of printer used.