Sigma SA mount
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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[1] but uses a flange focal distance of 44 mm, identical to that of the Canon EF lens mount. The mount uses only 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.
[edit] References
- ^ Stephen H. Westin. Pentax vs. Sigma SA Mount Comparison.
