英和和英

出典:『Wikipedia』 (2011/05/26 17:09 UTC 版)

英語による解説

引用

The Sigma SA mount is a design of lens mount designed by the Sigma Corporation of Japan for use on their single-lens reflex camera designs. The SA mount uses a bayonet mount which is physically similar to the Pentax K mount but uses a flange focal distance of 44 mm, identical to that of the Canon EF lens mount. The mount uses electrical communication between body and lens, like the EF mount, and in fact uses the same signalling lines and protocol as the EF mount, despite the physical incompatibility. Sigma has long produced EF-mount lenses for Canon cameras, and thus had the ability to use this protocol. All Sigma SLRs and DSLRs can use manual focus lenses too, which have no electrical communication between body and lens. Nikon mount and M42 mount lenses can be fitted and used via easily available lensmount adapters. Pentax K mount (PK) lenses can be fitted straight onto the SA mount, after the protruding AA lever and AA protector outcrop are removed, though the fit is slightly loose as the SA mount has a slightly bigger bore than the PK mount. Some Sigma DSLR users have become adept at converting high quality manual focus lenses to fit the SA mount. One such user, in the UK, has successfully converted Nikon, Contax Carl Zeiss, Minolta MD and Canon FL and FD lenses to fit the SA mount. Others have even produced replacement mounting plates for Sigma DSLRs, which convert them to either Nikon or Leica R mount.