Canon EOS-R (RF-mount)

Not to be confused with Canon R lens mount or Contax RF-mount.

The Canon RF lens mount is an interchangeable-lens mount developed by Canon for its full-frame mirrorless interchangeable-lens cameras, and featured first by the EOS R, followed by the EOS RP. The RF mount was announced in September 2018.

The RF mount allows for the use of Canon EF and EF-S mount lenses using one of three Canon-made lens adapters. When an EF-S lens is attached, however, the camera will only function as an APS-C camera, not a full-frame camera.

  • Inner diameter: 54 mm
  • Flange focal distance: 20 mm
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