Mechanical focus
31Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
32Photography — is the art, science and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor or chemically by means of a light sensitive material such as photographic… …
33Cooper Union — Coordinates: 40°43′45″N 73°59′26″W / 40.72927°N 73.99058°W / 40.72927; 73.99058 …
34Aperture — For other uses, see Aperture (disambiguation). f stops demonstrated on a lens …
35Timeline of progressive rock and progressive metal — This is a list of events, artists, and albums constituting a timeline of major developments in progressive rock and progressive metal.Contents1962 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 …
36CSA (database company) — CSA Illumina (formerly Cambridge Scientific Abstracts) is a provider of online databases, based in Ann Arbor, Michigan.[1] It is now a division of ProQuest, which in turn is now a subsidiary of the Cambridge Information Group.[2] The company… …
37Lenses for SLR and DSLR cameras — This article is about photographic lenses for single lens reflex film cameras (SLRs) and digital single lens reflex cameras (DSLRs). Furthermore, the emphasis is on modern lenses for 35 mm film SLRs and for DSLRs with sensor sizes less than or… …
38United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
39Optics — For the book by Sir Isaac Newton, see Opticks. Optical redirects here. For the musical artist, see Optical (artist). Optics includes study of dispersion of light. Optics is the branch of …
40Olympus OM system — The Olympus OM System was a line of 35mm single lens reflex cameras, lenses and accessories sold by Olympus between 1972 and 2002 (some accessories were sold through early 2003). The system was introduced by Olympus in 1972, more than a decade… …
