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A lens mount is an interface — mechanical and often also electrical — between a photographic camera body and a lens. It is confined to cameras where the body allows interchangeable lenses, most usually the rangefinder camera, single lens reflex type or any movie camera of 16 mm or higher gauge. Lens mounts are also used to connect optical components in instrumentation that may not involve a camera, such as the modular components used in optical laboratory prototyping which join via C-mount or T-mount elements. A lens mount may be a screw-threaded type, a bayonet-type, or a breech-lock (friction lock) type. Modern still camera lens mounts are of the bayonet type, because the bayonet mechanism precisely aligns mechanical and electrical features between lens and body. Screw-threaded mounts are fragile and do not align the lens in a reliable rotational position, yet types such as the C-mount interface are still widely in use for other applications like video cameras and optical instrumentation. Bayonet mounts generally have a number of tabs (often three) around the base of the lens, which fit into appropriately sized recesses in the lens mounting plate on the front of the camera. The tabs are often "keyed" in some way to ensure that the lens is only inserted in one orientation, often by making one tab a different size. Once inserted the lens is fastened by turning it a small amount. It is then locked in place by a spring-loaded pin, which can be operated to remove the lens. Lens mounts of competing manufacturers (Sony, Nikon, Canon, Contax/Yashica, Pentax, etc.) are almost always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance from the lens mount to the film or sensor can also be different. Many allege that these incompatibilities are due to the desire of manufacturers to "lock in" consumers to their brand. In movie cameras, the two most popular mounts in current usage on professional digital cinematography cameras are Arri's PL-mount and Panavision's PV-mount. The PL-Mount is used both on Arri and R.E.D. digital cinematography cameras, which are in 2012 the most used cameras for films shot in digital. The Panavision mounts are exclusively used with Panavision lenses, and thus are only available on Panaflex cameras or third-party cameras "Panavised" by a Panavision rental house, whereas the PL-mount style is favored with most other cameras and cine lens manufacturers. Both of these mounts are held in place with locating pins and friction locking rings. Other mounts which are now largely historical or a minority in relation to current practices are listed below. == List of lens mount types == These types are organized by category; find details in the section that follows. ;Stills * Canon EF * Canon EF-M * Canon EF-S * Canon FD * Canon FL * Contax N * Contax/Yashica bayonet * Contax RF bayonet * Diana+ * Exakta bayonet mount * Four Thirds bayonet mount * Fujica X bayonet * Fujifilm X-mount * Hasselblad V-mount * Konica F-mount * Konica AR-mount * M39 lens mount * Leica M mount * Leica R bayonet * Leica S-mount * Leica L mount * M42 * Mamiya bayonet * Minolta A-mount aka Sony A-mount * Minolta V-mount (Vectis) * Minolta SR-mount (MC/MD) * Miranda bayonet ''(all Miranda cameras had a dual bayonet/M44 screw mount)'' * Nikon F-mount * Nikon S-mount * Nikon 1-mount * Olympus OM-mount * Pentacon 6/P6 * Pentax K * Pentax Q * Rollei QBM Quick Bayonet mount * Sigma SA * Samsung NX-mount * T-mount (T-thread) * Topcon (Exakta) bayonet mount * Yashica AF (MA) ;Cinematography * Aaton universal * Arri bayonet * Arri PL * Arri standard * B4 * BNCR * C mount * Kodak S-mount * CA-1 * PV (Panavision) * Sony FZ-mount ;Universal (stills and movie) * Micro Four Thirds system * Sony E-mount ;Medical * Minolta SR-mount (MC/MD) * Olympus OM-mount ;Industrial * C mount * CS mount * Front-plate mount * T-mount (T-thread) * Minolta A-mount * Nikon F-mount * S-mount (M12 thread) ;CCTV * C mount * CS mount * D mount * S-mount (M12 thread) ;Scientific * C mount * CS mount 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「Lens mount」の詳細全文を読む スポンサード リンク
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