aperture filter
71Iron sight — Sight picture through iron sights of an H K MP5 submachine gun. The annular shroud around the front post sight is aligned with the rear peep sight to ensure the weapon is properly trained. Iron sights are a system of shaped alignment markers… …
72Diskrete Fouriertransformation — Die Diskrete Fourier Transformation oder DFT ist die Fourier Transformation eines zeitdiskreten periodischen Signals. Dabei wird das periodische Signal als Superposition eines Gleichanteils, einer Grundschwingung und ihrer Oberschwingungen in ein …
73Autofocus — 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… …
74Coulter principle — Coulter patented several different implementations of the Coulter Principle. Image taken from US Patent #2,656,508. The term “Coulter Principle” refers to the use of an electric field for counting and sizing dilute suspensions of particles in… …
75gastropod — /gas treuh pod /, n. 1. any mollusk of the class Gastropoda, comprising the snails, whelks, slugs, etc. adj. 2. Also, gastropodous /ga strop euh deuhs/. belonging or pertaining to the gastropods. [1820 30; < NL Gast(e)ropoda a class of mollusks.… …
76Canon EOS 20D — Infobox Digicam model = Canon EOS 20D kind = Single lens reflex sensor = 22.5 mm times; 15.0 mm CMOS res = 3,520 times; 2,344 (8.25 megapixels) lens = Interchangeable (EF EF S) viewfinder = Optical storage = CompactFlash (CF) (Type I or Type II)… …
77protozoan — /proh teuh zoh euhn/, n., pl. protozoans, (esp. collectively) protozoa / zoh euh/, adj. Biol. n. 1. any of a diverse group of eukaryotes, of the kingdom Protista, that are primarily unicellular, existing singly or aggregating into colonies, are… …
78Lensbaby — camera lenses are a line of camera lenses produced by Lensbabies that mate a simple lens with a bellows for use in special effect photography. Lensbaby lenses can be used on cameras which accept interchangeable lenses, mainly of the 35 mm or… …
79Diaphragm (optics) — A 35 mm lens set to f/8; the diameter of the seven sided entrance pupil, the virtual image of the opening in the iris diaphragm, is 4.375 mm In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of… …
80Minolta AF 500mm Reflex lens — Minolta 500mm f/8 Reflex Key features Maker: Minolta, Sony Ultrasonic motor:  No Macro capable …
