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 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 and a 47 mm throat diameter. As it is designed for use with an APS-C-sized image sensor, it features the same crop factor 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 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 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:| Camera | Sensor | Maximum Resolution | Autofocus System | Shutter Speeds | Continuous Shooting | Date Introduced | Weight |
| EOS M | 22.3 × 14.9 mm CMOS | 18 Mp | Hybrid CMOS AF | 30 s to 1/4000 s and bulb | 4.3 fps | 2012-06 | 262 g |
| EOS M2 | 22.3 × 14.9 mm CMOS | 18 Mp | Hybrid CMOS AF | 30 s to 1/4000 s and bulb | 3.4 fps | 2013-12 | 274 g including battery |
| EOS M3 | 22.3 × 14.9 mm CMOS | 24 MP | Hybrid CMOS AF III | 1/4000s to 30 s | 4.2 fps | 2015-02-06 | 366 g including battery |
| EOS M5 | 22.3 × 14.9 mm CMOS | 24 MP | Dual-Pixel CMOS AF | 30 s to 1/4000 s | 9 fps; 7 fps with autofocus | 2016-09-15 | 427 g |
| EOS M6 | 22.3 × 14.9 mm CMOS | 24 MP | Dual-Pixel CMOS AF | 30 s to 1/4000 s | 9 fps; 7 fps with autofocus | 2017-02-14 | 390 g |
| EOS M6 Mark II | 22.3 × 14.9 mm CMOS | 32 MP | Dual-Pixel CMOS AF | 30 s to 1/4000 s; electronic 1/16000 s | 14 fps with autofocus | 2019-08-28 | 408 g |
| EOS M10 | 22.3 × 14.9 mm CMOS | 18 Mp | Hybrid CMOS AF II | 30 s to 1/4000 s | 4.6 frames per second | 2015-10-13 | 301 g including battery |
| EOS M50 | 22.3 × 14.9 mm CMOS | 24 MP | Dual-Pixel CMOS AF | 30 s to 1/4000 s | 10 fps; 7.4 fps with autofocus | 2018-03-23 | 387 g |
| EOS M50 Mark II | 22.3 × 14.9 mm CMOS | 24 MP | Dual-Pixel CMOS AF | 30 s to 1/4000 s | 10 fps; 7.4 fps with autofocus | 2020-10-14 | 387 g |
| EOS M100 | 22.3 × 14.9 mm CMOS | 24 MP | Dual-Pixel CMOS AF | 30 s to 1/4000 s | 6.1 fps; 4 fps with autofocus | 2017-08-29 | 302 g including battery |
| EOS M200 | 22.3 × 14.9 mm CMOS | 24 MP | Dual-Pixel CMOS AF | 30 s to 1/4000 s | 6.1 fps; 4 fps with autofocus | 2019-09-25 | 299 g including battery |