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. In May 2022, Canon announced APS-C EOS R cameras and RF-S lenses designed for these cameras.
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 RF-S or EF-S lens is attached, however, the camera will only function as an APS-C camera, not a full-frame camera.
The "RF" retroactively stands for "Re-Imagined Focus".

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:
If an EF-EOS R Mount Adapter is used to mount an EF-S lens, the image will have to be cropped by 1.6x due to the smaller image circle on EF-S lenses.

Cameras

All Canon EOS R-series cameras utilize the RF lens mount, starting with the EOS R. In addition, the following digital movie cameras in the Cinema EOS series utilize the RF mount:
In 2022, Canon licensed the RF lens mount to Red Digital Cinema, allowing the company to use the lens mount on the following cinema cameras:
  • RED Komodo 6K
  • RED Komodo-X
  • RED V-Raptor
  • RED V-Raptor XL

    Lenses

When Canon announced its first R-series body, it announced four new RF-mount lenses:
  • RF 24–105mm L IS USM
  • RF 28–70mm L USM
  • RF 35mm MACRO IS STM — 0.5× maximum magnification.
  • RF 50mm L USM
In conjunction with the February 2019 announcement of the entry-level full-frame EOS RP, Canon announced six additional lenses would be released by the end of that year, although it did not indicate release dates for any of them:
  • RF 85mm L USM
  • RF 85mm L USM DS — Same as the above, except includes "defocus smoothing" technology intended to improve bokeh. According to Canon, the effect is similar to that of an apodization filter, but achieved through special lens coatings instead of a filter.
  • RF 24–240mm IS USM
  • RF 15–35mm L IS USM
  • RF 24–70mm L IS USM
  • RF 70–200mm L IS USM
In 2022, Canon introduced the first RF-S lenses for APS-C sensors, together with the R7 and R10 camera bodies with the first built in APS-C sensors in the R-System. Unlike EF-S mount lenses, RF-S lenses can be mounted on full-frame camera bodies; the camera body will automatically crop the image to fit the smaller image circle of the mounted lens.
RF-mount lenses are not compatible with EF, EF-S or EF-M mount camera bodies.

First-party lenses

Focal length
 rangeISLAFFiltersizeLensLenslengthWeightTypeHood
3.9RF-S
Dual
Fisheye		RF-S
STM		Rear gelatin×
Prime2024-06-11
5.2L Dual
Fisheye		Rear gelatin×
Prime2021-10-06
7.8RF-S
Dual
Fisheye		RF-S
STM		Prime2024-10-30
10–18RF-S
IS STM		STMZoomEW-53B2023-11-02
10–20L IS STMSTMRear gelatinZoombuilt into lens2023-10-11
14–30RF-S IS STM PZSTMZoomEW-63C2025-03-26
14–35L IS USMUSMZoomEW-83P2021-06-29
15–30IS STMSTMZoomEW-73E2022-07-12
15–35L IS USMUSMZoomEW-88F2019-08-28
16STMSTMPrimeEW-65C2021-09-14
16–28IS STMSTMZoomEW-73E2025-01-24
18–45RF-S
IS STM		STMZoomEW-532022-05-25
18–150RF-S IS STMSTMZoomEW-60F2022-05-25
20L VCMNano USM, VCMPrimeEW-73G2025-06-26
24L VCMNano USM, VCMPrimeEW-73G2024-10-30
24Macro IS STMSTMPrimeEW-65B2022-07-12
24–50IS STMSTMZoomEW-63C2023-02-08
24–70L IS USMUSMZoomEW-88E2019-08-28
24–105L IS USM USMZoomEW-88E2023-11-02
24–105L IS USMUSMZoomEW-83N2018-09-05
24–105IS STMSTMZoomEW-73D2020-02-13
24–240IS USMUSMZoomEW-78F2019-07-09
28STMSTMPrimeEW-552023-05-24
28–70L USMUSMZoomEW-1032018-09-05
28–70IS STMSTMZoomEW-73D2024-09-12
35L VCMNano USM, VCMPrimeEW-73F2024-06-05
35Macro IS STMSTMPrimeEW-522018-09-05
45STMSTMPrimeES-73B2025-11-06
50L USMUSMPrimeES-832018-09-05
50L VCMNano USM, VCMPrimeES-732024-10-30
50STMSTMPrimeES-65B2020-11-04
55–210RF-S IS STMSTMZoomET-60B2023-02-08
70–200L IS USM
USM		ZoomET-83F 2019-10-24
70–200L IS USM Z
USM		ZoomET-88C 2024-10-30
70–200L IS USMUSMZoomET-83G 2020-11-04
75–300DCD.C.ZoomET-602025-04-29
85L USMUSMPrimeET-892019-05-08
85L USM USMPrimeET-892019-10-24
85L VCMNano USM, VCMPrimeEW-73C2025-09-09
85Macro IS STMSTMPrimeET-772020-07-09
100Macro L IS USMUSMPrimeET-73C2021-04-14
100–300L IS USMUSMZoomET-1242023-04-20
100–400IS USMUSMZoomET-74B2021-09-14
100–500L IS USMUSMZoomET-83F 2020-07-09
135L IS USMUSMPrimeEW-88B2022-11-02
200–800IS USMUSMZoomET-1012023-11-02
400L IS USMUSM drop-inPrimeET-155
ET-155B		2021-04-14
600L IS USMUSM drop-inPrimeET-160
ET-160B		2021-04-14
600IS STMSTMPrimeET-88B2020-07-09
800L IS USMUSM drop-inPrimeET-155
ET-155B 		2022-02-24
800IS STMSTMPrimeET-1012020-07-09
1200L IS USMUSM drop-inPrimeET-160
ET-160B 		2022-02-24