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Canon EOS (Electro-Optical System) is an autofocus single-lens reflex camera (SLR) camera series produced by Canon Inc.. Introduced in 1987 with the Canon EOS 650, all EOS cameras used 35 mm film until October 1996 when the EOS IX was released using the new and short-lived APS (Advantix/IX) film. In 2000, the D30 was announced, as the first digital SLR designed and produced entirely by Canon. Since 2005, all newly announced EOS cameras have used digital image sensors rather than film. The EOS line is still in production as Canon's current digital SLR (DSLR) range, and, with the 2012 introduction of the Canon EOS M, Canon's mirrorless interchangeable-lens camera (MILC) system. The acronym "EOS" was chosen for Eos, the Titan goddess of the dawn in Greek mythology,〔http://www.canon.com/camera-museum/history/canon_story/1987_1991/1987_1991.html〕 and is often pronounced as a word ( or ), although some spell out the letters, reading it as an initialism. It competes primarily with the Nikon F series and its successors, as well as autofocus SLR systems from Olympus Corporation, Pentax, Sony/Minolta, and Panasonic/Leica. In 2010, Canon held 44.5% market share in DSLRs.〔(【引用サイトリンク】title=DSLR Worldwide Market Share, 2010 )〕 At the heart of the system is the EF lens mount, which replaced the previous FD lens mount, which mainly supported only manual-focus lenses. ==EF lens mount== (詳細はFD mount, it was designed with no mechanical linkages between moving parts in the lens and in the camera. The aperture and focus are controlled via electrical contacts, with motors in the lens itself. This was similar in some ways to Canon's earlier attempt at AF with the T80. Other manufacturers including Contax (with its G series of interchangeable-lens 35 mm rangefinder cameras), Nikon's 1983 F3AF and Olympus (with its Four Thirds System) have since embraced this type of direct drive system. It is a large lens mount compared to most of its competition, enabling the use of larger aperture lenses.〔(【引用サイトリンク】title=Canon History Hall: Birth of New-Generation Autofocus SLR Camera, "EOS" )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Canon EOS」の詳細全文を読む スポンサード リンク
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