Canon EF-M lens mount explained

Mount Name:Canon M mount
Type:bayonet
Inner Diameter:47 mm
Flange:18 mm

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.

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 2.0 and 32 mm 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 M22.3 × 14.9 mm CMOS (APS-C type)18 Mp (5184 × 3456)Hybrid CMOS AF30 s to 1/4000 s and bulb4.3 fps2012-06262 g (9.2 oz)
EOS M222.3 × 14.9 mm CMOS (APS-C type)18 Mp (5184 × 3456)Hybrid CMOS AF30 s to 1/4000 s and bulb3.4 fps2013-12274 g (9.7 oz) including battery
EOS M322.3 × 14.9 mm CMOS (APS-C type)24 MP (6000 × 4000)Hybrid CMOS AF III1/4000s to 30 s4.2 fps2015-02-06366 g (12.9 oz) including battery
EOS M522.3 × 14.9 mm CMOS (APS-C type)24 MP (6000 × 4000)Dual-Pixel CMOS AF30 s to 1/4000 s9 fps; 7 fps with autofocus2016-09-15427 g (15.1 oz)
EOS M622.3 × 14.9 mm CMOS (APS-C type)24 MP (6000 × 4000)Dual-Pixel CMOS AF30 s to 1/4000 s9 fps; 7 fps with autofocus2017-02-14390 g (13.8 oz)
EOS M6 Mark II22.3 × 14.9 mm CMOS (APS-C type)32 MP (6960 × 4640)Dual-Pixel CMOS AF30 s to 1/4000 s; electronic 1/16000 s14 fps with autofocus2019-08-28408 g (14.4 oz)
EOS M10[3] 22.3 × 14.9 mm CMOS (APS-C type)18 Mp (5184 × 3456)Hybrid CMOS AF II30 s to 1/4000 s4.6 frames per second2015-10-13301 g (10.6 oz) including battery
EOS M5022.3 × 14.9 mm CMOS (APS-C type)24 MP (6000 × 4000)Dual-Pixel CMOS AF30 s to 1/4000 s10 fps; 7.4 fps with autofocus2018-03-23387 g (13.7 oz)
EOS M50 Mark II22.3 × 14.9 mm CMOS (APS-C type)24 MP (6000 × 4000)Dual-Pixel CMOS AF30 s to 1/4000 s10 fps; 7.4 fps with autofocus2020-10-14387 g (13.7 oz)
EOS M100[4] 22.3 × 14.9 mm CMOS (APS-C type)24 MP (6000 × 4000)Dual-Pixel CMOS AF30 s to 1/4000 s6.1 fps; 4 fps with autofocus2017-08-29302 g (10.7 oz) including battery
EOS M20022.3 × 14.9 mm CMOS (APS-C type)24 MP (6000 × 4000)Dual-Pixel CMOS AF30 s to 1/4000 s6.1 fps; 4 fps with autofocus2019-09-25299 g (10.6 oz) including battery

List of EF-M lenses from Canon

Focal lengthEquivalent focal length
(×1.6 crop factor)
Aperture rangeIntroducedMacroUSMSTMISL-seriesDOMin focusing distanceFilter sizeLens diameterLens lengthWeight
11–22 mm18 – 35 mm4 – 5.620130.15m/0.5ft55 mm60.9 mm58.2 mm220 g
15–45 mm24 – 72 mm3.5 – 6.320150.25m/0.8ft49 mm60.9 mm44.5 mm130 g
18–55 mm29 – 88 mm3.5 – 5.620120.25m52 mm60.9 mm61.0 mm210 g
18–150 mm29 – 240 mm3.5 – 6.320160.45m/1.5ft55 mm60.9 mm86.5 mm300 g
55–200 mm88 – 320 mm4.5 – 6.320141.0m/3.3ft52 mm60.9 mm86.5 mm260 g
22 mm35 mm220120.15m/0.49ft43 mm60.9 mm23.7 mm105 g
28 mm45 mm3.520160.097m (1:1), 0.093m (1.2:1)43 mm60.9 mm45.5 mm130 g
32 mm51 mm1.420180.23m/0.76ft43 mm60.9 mm56.5 mm235 g

List of EF-M lenses from 3rd-party (AF only)

ManufacturerFocal lengthEquivalent focal length
(×1.6 crop factor)
Aperture rangeIntroducedFilter size
Tamron18 – 200 mm29 – 320 mm3.5 – 6.3201455 mm
Sigma16 mm26 mm1.4201967 mm
Sigma30 mm48 mm1.4201952 mm
Sigma56 mm90 mm1.4201955 mm
Viltrox23 mm37 mm1.4202052 mm
Viltrox33 mm53 mm1.4202052 mm
Viltrox56 mm90 mm1.4202052 mm

Notes and References

  1. Web site: Canon EOS M hands-on preview. DPReview.
  2. News: Canon Japan formally discontinues the last EOS-M cameras, saying goodbye to EF-M. Richard Butler. Digital Photography Review. 21 October 2023.
  3. Web site: Canon U.S.A., Inc., Announces New Feeding Accessory and Fiery-powered Controllers for the imagePRESS C910 Series . 2020-07-22.
  4. Web site: 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.