In optics, the aperture of an optical system (including a system consisted of a single lens) is a hole or an opening that primarily limits light propagated...
40 KB (5,147 words) - 20:29, 2 September 2024
F-number (redirect from Relative aperture)
relative aperture, because it is the inverse of the relative aperture, defined as the aperture diameter divided by focal length. The relative aperture indicates...
43 KB (5,424 words) - 14:08, 7 September 2024
In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can...
17 KB (2,287 words) - 19:22, 25 August 2024
Look up aperture in Wiktionary, the free dictionary. The aperture of an optical system is the opening that limits the amount of light that can pass through...
2 KB (280 words) - 09:04, 13 May 2024
The angular aperture of a lens is the angular size of the lens aperture as seen from the focal point: a = 2 arctan ( D / 2 f ) = 2 arctan ( D 2 f...
1 KB (175 words) - 05:57, 16 May 2021
The lateral aperture of the fourth ventricle or foramen of Luschka (after anatomist Hubert von Luschka) is an opening at the lateral extremity of either...
2 KB (151 words) - 06:50, 27 August 2024
Aperture priority, often abbreviated A or Av (for aperture value) on a camera mode dial, is a mode on some cameras that allows the user to set a specific...
4 KB (443 words) - 09:43, 9 October 2023
The median aperture (also known as the medial aperture and foramen of Magendie) is an opening of the fourth ventricle at the caudal portion of the roof...
4 KB (483 words) - 14:30, 7 May 2024
In electromagnetics and antenna theory, the aperture of an antenna is defined as "A surface, near or on an antenna, on which it is convenient to make assumptions...
21 KB (3,345 words) - 22:45, 24 June 2024
Diaphragm (optics) (redirect from Aperture diaphragm)
opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it...
11 KB (1,330 words) - 12:19, 8 September 2024