number aperture
21f-number — [ef′num΄bər] n. Photog. a number that represents the relative aperture of a lens, equal to the focal length divided by the effective diameter of the lens aperture: a higher number indicates a smaller opening …
22f-number — noun Etymology: focal length Date: circa 1903 1. the ratio of the focal length to the aperture in an optical system 2. a number following the symbol f/ that expresses the effectiveness of the aperture of a camera lens in relation to brightness of …
2322 (number) — This article is about the number. For other uses, see 22 (disambiguation). ← 21 23 → 22 ← 20 21 22 …
24Very-small-aperture terminal — A 2.5 m parabolic dish antenna for bidirectional satellite Internet access A very small aperture terminal (VSAT), is a two way satellite ground station or a stabilized maritime Vsat antenna with a dish antenna that is smaller than 3 meters. The… …
25numerical aperture — nu·mer·i·cal aperture n(y)u̇ mer i kəl n a number that indicates the resolving power of a microscope objective and is equal to the product of the index of refraction of the medium (as immersion oil) in front of the objective and the sine of half… …
26f-number — /ef num beuhr/, n. Optics, Photog. a number corresponding to the ratio of the focal length to the diameter of a lens system, esp. a camera lens. In f/ 1.4, 1.4 is the f number and signifies that the focal length of the lens is 1.4 times as great… …
27Very small aperture terminal — A Very Small Aperture Terminal (VSAT), is a two way satellite ground station with a dish antenna that is smaller than 3 meters (most VSAT antennas range from 75 cm to 1.2 m). VSAT data rates typically range from narrowband up to 4 Mbit/s. VSATs… …
28Marketing part number — The Marketing Part Number is code that Apple Computer uses to classify all of its items in a unique way[citation needed]. A typical Marketing Part Number are M8738LL/A for an 20 GB iPod or M9454LL/A for a Power Macintosh G5. Hardware usually… …
29f-number — focal distance divided by the effective diameter of the camera lens aperture (Photography) …
30f-number — noun Photography the ratio of the focal length of a camera lens to the diameter of the aperture being used for a particular shot …
