aperture mirror
101David Dunlap Observatory — The 74 inch (1.9 m) telescope at the David Dunlap Observatory Organizati …
102Camera obscura — This article is about an optical device. For other uses, see Camera obscura (disambiguation) …
103Pinhole camera — A pinhole camera is a very simple camera with no lens and a single very small aperture. Simply explained it is a light proof box with a single hole in one side. Light from a scene passes through this single point and projects an inverted image on …
104Antenna (radio) — Whip antenna on car …
105Autofocus — For the film of the same name, see Auto Focus. An autofocus (or AF) optical system uses a sensor, a control system and a motor to focus fully automatic or on a manually selected point or area. An electronic rangefinder has a display instead of… …
106laser — /lay zeuhr/, n. Physics. a device that produces a nearly parallel, nearly monochromatic, and coherent beam of light by exciting atoms to a higher energy level and causing them to radiate their energy in phase. Also called optical maser. [1955 60; …
107Parabolic antenna — A parabolic satellite communications antenna at Erdfunkstelle Raisting, the biggest facility for satellite communication in the world, in Raisting, Bavaria, Germany. It has a Cassegrain type feed. A parabolic antenna is an antenna that uses a… …
108Sigma SD10 — Infobox Digicam model = Sigma SD10 kind = Digital single lens reflex sensor = 20.7 mm x 13.8 mm Foveon X3 sensor res = 2268 × 1512 × 3 (10.2 million photoelements) lens = Interchangeable (Sigma SA mount) viewfinder = Optical, pentaprism storage …
109Zenit (camera) — This article is about the Russian camera brand. For the astronomic or geodetic instruments directed to the zenith, see Zenith camera. : For other uses, see Zenit (disambiguation). Zenit is a Russian (and formerly Soviet) camera brand manufactured …
110List of astronomy acronyms — This is a compilation of acronyms commonly used in astronomy. Most of the acronyms are drawn from professional astronomy and are used quite frequently in scientific publications. However, a few of these acronyms are frequently used by the general …
