![]() ![]() ![]() M42-mount lenses can be mounted via adapters utilizing the SA inner bayonet.ĭespite of the physical similarities Pentax K-mount (PK) lenses can't really be fitted straight onto the SA-mount as well, once 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. In September 2018, Sigma announced that they will stop the development of SA-mount cameras and focus on the Leica L-mount, as members of the L-Mount Alliance alongside Panasonic. Sigma has long produced EF-mount lenses for Canon cameras, and thus had the ability to use this protocol.Īll Sigma SLRs and DSLRs can use manual focus lenses too, which have no electrical communication between body and lens. Like the EF-mount, the SA-mount uses electrical communication between body and lens, and in fact uses the same signalling lines and protocol as the EF-mount, despite the physical incompatibility. Mechanically, the (inner) SA-mount is similar to the Pentax K-mount as well, but with a flange focal distance of 44.00 mm, identical to that of the Canon EF-mount. There were two precursors to the introduction of SA-mount cameras, the manual-focus Sigma Mark-I in 1976, which still featured a M42 screw lens mount, and the SA-1 of 1983 with Pentax K-mount. Originally, the SA-mount was a dual- bayonet mount with inner ( SA-IB) and outer ( SA-OB) bayonets, the latter being a feature intended to mount heavy telephoto lenses, but never utilized by Sigma and consequently dropped with the release of the SD14 in 2007. It was introduced with the SA-300 in 1992. The Sigma SA-mount is a lens mount by the Sigma Corporation of Japan for use on their autofocus single-lens reflex and mirrorless cameras. For another camera mount sometimes also abbreviated as "SA"-mount, see Sony A-mount. ![]()
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