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 was one of Canon's two 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 EOS EF-M system was officially discontinued in October 2023. Canon had not released any new cameras or lenses for a number of years prior to the discontinuation.
The M system is somewhat limited as Canon only released eight native lenses, listed below. There was 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 DSLR.
Compatibility The cameras that can use the EF-M mount are: +CameraSensorMaximum ResolutionAutofocus SystemShutter SpeedsContinuous ShootingDate IntroducedWeightEOS 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 batteryEOS M322.3 × 14.9 mm CMOS (APS-C type)24 MP (6000 × 4000)Hybrid CMOS AF III30 s to 1/4000 s4.2 fps2015-02-06366 g (12.9 oz) including batteryEOS 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 M1022.3 × 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 batteryEOS 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 M10022.3 × 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 batteryEOS 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 length Equivalent focal length(×1.6 crop factor) Aperture range Introduced Macro USM STM IS L-series DO Min focusing distance Filter sizeLens diameterLens lengthWeight 11–22 mm 18 – 35 mm 4 – 5.6 2013 0.15m/0.5ft 55 mm 60.9 mm 58.2 mm 220 g 15–45 mm 24 – 72 mm 3.5 – 6.3 2015 0.25m/0.8ft 49 mm 60.9 mm 44.5 mm 130 g 18–55 mm 29 – 88 mm 3.5 – 5.6 2012 0.25m 52 mm 60.9 mm 61.0 mm 210 g 18–150 mm 29 – 240 mm 3.5 – 6.3 2016 0.45m/1.5ft 55 mm 60.9 mm 86.5 mm 300 g 55–200 mm 88 – 320 mm 4.5 – 6.3 2014 1.0m/3.3ft 52 mm 60.9 mm 86.5 mm 260 g 22 mm 35 mm 2 2012 0.15m/0.49ft 43 mm 60.9 mm 23.7 mm 105 g 28 mm 45 mm 3.5 2016 0.097m (1:1), 0.093m (1.2:1) 43 mm 60.9 mm 45.5 mm 130 g 32 mm 51 mm 1.4 2018 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 3.5 – 6.3 2014 55 mm Sigma 16 mm 26 mm 1.4 2019 67 mm Sigma 30 mm 48 mm 1.4 2019 52 mm Sigma 56 mm 90 mm 1.4 2019 55 mm Viltrox 23 mm 37 mm 1.4 2020 52 mm Viltrox 33 mm 53 mm 1.4 2020 52 mm Viltrox 56 mm 90 mm 1.4 2020 52 mm
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