Canon RF lens 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. Details. 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. 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. The EF-M mount has a flange focal distance of 18 mm. An EF-EOS R lens adapter enables Canon EF, EF-S, TS-E and MP-E lenses to be used on cameras that have the RF mount. The three adapters have differing features: The EOS R is a 30 megapixel (6720  × 4480) full-frame camera. If an EF-EOS R Mount Adapter is used with it to mount an EF-S lens, the camera will function as an 11.6 megapixel (4176 × 2784) crop camera. Lenses. At the time Canon announced its first R-series body, it announced four new RF-mount lenses: In conjunction with the February 2019 announcement of the entry-level full-frame EOS RP, Canon announced that six additional lenses would be released by the end of that year, although it did not indicate release dates for any of them: In 2020, Canon has introduced 7  new RF mount lenses: In 2021, Canon has introduced 7 new RF mount lenses: RF-mount lenses are not compatible with EF, EF-S or EF-M mount camera bodies. Compatibility. The cameras that can use the RF mount are: