Canon EF-M lens mount

The Canon EF-M lens mount, introduced in 2012, is a derivative of the Canon EF lens mount designed for use with the Canon EOS M mirrorless interchangeable-lens camera. The EF-M lens mount is one of Canon's two new systems for mirrorless cameras, the other being the RF mount.

Canon M mount
EF-M lens mount of a Canon EF/EF-S to EF-M adapter mount
Typebayonet
Inner diameter47 mm
Flange18 mm

The M system has an 18 mm flange focal distance (compared to 20 mm for RF and 44 mm for EF and EF-S) and a 47 mm throat diameter (compared to 54 mm for EF, EF-S, and RF). As it is designed for use with an APS-C-sized image sensor, it features the same crop factor (of roughly 1.6) as the existing EF-S lens mount.

The M system is somewhat limited as Canon has issued relatively few native lenses, listed below. There is a lack of native lenses with a large aperture, the exceptions being 22 mm f/2.0 and 32 mm f/1.4. In 2014, third party manufacturers started to present their M lenses. In addition, it is possible to use Canon EF and EF-S lenses (made for the Canon DSLRs) with an adapter. This solution reportedly works well also with regard to the autofocus, but it takes away the size advantage of the smaller M system. Suitable adapters (from EF to M or from EF-S to M) are made by Canon as well as third party manufacturers. As is common with mirrorless systems, the adapter solution is not backwards-compatible with Canon's DSLR cameras: this means that you cannot put M lenses on a non-M DSLR.[1]

The EOS EF-M system was discontinued in October 2023.[2]

Compatibility

The cameras that can use the EF-M mount are:

Camera Sensor Maximum Resolution Autofocus System Shutter Speeds Continuous Shooting Date Introduced Weight
EOS M 22.3 × 14.9 mm CMOS (APS-C type) 18 Mp (5184 × 3456) Hybrid CMOS AF 30 s to 1/4000 s and bulb 4.3 fps 2012-06 262 g (9.2 oz)
EOS M2 22.3 × 14.9 mm CMOS (APS-C type) 18 Mp (5184 × 3456) Hybrid CMOS AF 30 s to 1/4000 s and bulb 3.4 fps 2013-12 274 g (9.7 oz) including battery
EOS M3 22.3 × 14.9 mm CMOS (APS-C type) 24 MP (6000 × 4000) Hybrid CMOS AF III 1/4000s to 30 s 4.2 fps 2015-02-06 366 g (12.9 oz) including battery
EOS M5 22.3 × 14.9 mm CMOS (APS-C type) 24 MP (6000 × 4000) Dual-Pixel CMOS AF 30 s to 1/4000 s 9 fps; 7 fps with autofocus 2016-09-15 427 g (15.1 oz)
EOS M6 22.3 × 14.9 mm CMOS (APS-C type) 24 MP (6000 × 4000) Dual-Pixel CMOS AF 30 s to 1/4000 s 9 fps; 7 fps with autofocus 2017-02-14 390 g (13.8 oz)
EOS M6 Mark II 22.3 × 14.9 mm CMOS (APS-C type) 32 MP (6960 × 4640) Dual-Pixel CMOS AF 30 s to 1/4000 s; electronic 1/16000 s 14 fps with autofocus 2019-08-28 408 g (14.4 oz)
EOS M10[3] 22.3 × 14.9 mm CMOS (APS-C type) 18 Mp (5184 × 3456) Hybrid CMOS AF II 30 s to 1/4000 s 4.6 frames per second 2015-10-13 301 g (10.6 oz) including battery
EOS M50 22.3 × 14.9 mm CMOS (APS-C type) 24 MP (6000 × 4000) Dual-Pixel CMOS AF 30 s to 1/4000 s 10 fps; 7.4 fps with autofocus 2018-03-23 387 g (13.7 oz)
EOS M50 Mark II 22.3 × 14.9 mm CMOS (APS-C type) 24 MP (6000 × 4000) Dual-Pixel CMOS AF 30 s to 1/4000 s 10 fps; 7.4 fps with autofocus 2020-10-14 387 g (13.7 oz)
EOS M100[4] 22.3 × 14.9 mm CMOS (APS-C type) 24 MP (6000 × 4000) Dual-Pixel CMOS AF 30 s to 1/4000 s 6.1 fps; 4 fps with autofocus 2017-08-29 302 g (10.7 oz) including battery
EOS M200 22.3 × 14.9 mm CMOS (APS-C type) 24 MP (6000 × 4000) Dual-Pixel CMOS AF 30 s to 1/4000 s 6.1 fps; 4 fps with autofocus 2019-09-25 299 g (10.6 oz) including battery

List of EF-M lenses from Canon
Focal length Equivalent focal length
(×1.6 crop factor)		 Aperture range Introduced Macro USM STM IS L-series DO Min focusing distance Filter size Lens diameter Lens length Weight
11–22 mm 18 – 35 mm f/4 – 5.6 2013 No No Yes Yes No No 0.15m/0.5ft 55 mm 60.9 mm 58.2 mm 220 g
15–45 mm 24 – 72 mm f/3.5 – 6.3 2015 No No Yes Yes No No 0.25m/0.8ft 49 mm 60.9 mm 44.5 mm 130 g
18–55 mm 29 – 88 mm f/3.5 – 5.6 2012 No No Yes Yes No No 0.25m 52 mm 60.9 mm 61.0 mm 210 g
18–150 mm 29 – 240 mm f/3.5 – 6.3 2016 No No Yes Yes No No 0.45m/1.5ft 55 mm 60.9 mm 86.5 mm 300 g
55–200 mm 88 – 320 mm f/4.5 – 6.3 2014 No No Yes Yes No No 1.0m/3.3ft 52 mm 60.9 mm 86.5 mm 260 g
22 mm 35 mm f/2 2012 No No Yes No No No 0.15m/0.49ft 43 mm 60.9 mm 23.7 mm 105 g
28 mm 45 mm f/3.5 2016 Yes No Yes Yes No No 0.097m (1:1), 0.093m (1.2:1) 43 mm 60.9 mm 45.5 mm 130 g
32 mm 51 mm f/1.4 2018 No No Yes No No No 0.23m/0.76ft 43 mm 60.9 mm 56.5 mm 235 g

List of EF-M lenses from 3rd-party (AF only)
Manufacturer Focal length Equivalent focal length
(×1.6 crop factor)		 Aperture range Introduced Filter size
Tamron 18 – 200 mm 29 – 320 mm f/3.5 – 6.3 2014 55 mm
Sigma 16 mm 26 mm f/1.4 2019 67 mm
Sigma 30 mm 48 mm f/1.4 2019 52 mm
Sigma 56 mm 90 mm f/1.4 2019 55 mm
Viltrox 23 mm 37 mm f/1.4 2020 52 mm
Viltrox 33 mm 53 mm f/1.4 2020 52 mm
Viltrox 56 mm 90 mm f/1.4 2020 52 mm

Images
  • Mount Adapter EF-EOS M
    Mount Adapter EF-EOS M
  • EF-M 11–22 mm f/4–5.6 IS STM
    EF-M 11–22 mm f/4–5.6 IS STM
  • EF-M 15–45 mm f/3.5–6.3 IS STM mounted on an EOS M6
    EF-M 15–45 mm f/3.5–6.3 IS STM mounted on an EOS M6
  • EF-M 18–55 mm f/3.5–5.6 IS STM
    EF-M 18–55 mm f/3.5–5.6 IS STM
  • EF-M 18–150 mm f/3.5–6.3 IS STM mounted at an EOS M5
    EF-M 18–150 mm f/3.5–6.3 IS STM mounted at an EOS M5
  • EF-M 55–200 mm f/4.5–6.3 IS STM
    EF-M 55–200 mm f/4.5–6.3 IS STM
  • EF-M 22 mm f/2 STM
    EF-M 22 mm f/2 STM

References
Wikimedia Commons has media related to Canon EF-M lenses.
Wikimedia Commons has media related to EF-M lens mount.
  1. "Canon EOS M hands-on preview". DPReview.
  2. Richard Butler. "Canon Japan formally discontinues the last EOS-M cameras, saying goodbye to EF-M". Digital Photography Review. Retrieved 21 October 2023.
  3. https://www.usa.canon.com/cusa/about_canon/newsroom/press_releases?pageKeyCode=pressreldetail&docId=0901e0248105d566. Retrieved 2020-07-22. {{cite web}}: Missing or empty |title= (help)
  4. "Step Up and Explore the Wonders of Photography With the Compact Yet Powerful New Canon EOS M100 Camera". Canon U.S.A., Inc. | Press Release Details.
  1. http://www.usa.canon.com/cusa/about_canon/newsroom/press_releases?pageKeyCode=pressreldetail&docId=0901e0248105d566
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