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The R mount was used on Canon's first single lens reflex (SLR) camera. The mount employed a "breech lock" system to attach the lens to the camera body. [1] The R mount was discontinued in 1964 and replaced with the Canon FL lens mount. [2] Many mirrorless interchangeable-lens cameras are able to use Canon R lenses via an adapter.
Canon full-frame cameras have used the EF lens mount since 1987. In comparison with that mount, the RF mount's inner diameter is the same at 54 mm. [1] The RF mount's flange focal distance at 20 mm is much shorter than that of the Canon EF and EF-S mounts at 44 mm.
Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from the ...
Canon developed and produced the Canon FD lens mount standard for film SLR cameras from 1971 to replace the FL lens mount standard. The FD mount had two variants – original lenses used a breechlock collar to mount whilst later versions used a standard bayonet twist lock with a short twist action. The EF lens mount standard superseded FD ...
The Canon EOS R was announced 5 September 2018 [8] [3] and released 9 October 2018. [1] It was the first of Canon's "EOS R System" [9] of mirrorless interchangeable-lens cameras, and it was the first camera to use Canon's RF lens mount.
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.
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