Canon EF-M lens mount

The Canon EF-M lens mount, introduced in 2012, was 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 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
Type	bayonet
Inner diameter	47 mm
Flange	18 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 was somewhat limited as Canon had only released 8 native lenses, listed below. There was 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 DSLR.^[1]

The EOS EF-M system was officially discontinued in October 2023. Although, Canon hadn't released any new cameras or lenses for a number of years prior to the discontinuation.^[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
• 
  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 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 55–200 mm f/4.5–6.3 IS STM
• 
  EF-M 22 mm f/2 STM