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 44 mm for EF and EF-S) and a 47 mm throat diameter (compared to 54 mm for EF and EF-S). 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 22mm/2.0 and 32mm/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. The adapter solution it is not backwards-compatible with Canon's existing DSLR cameras: this means that you cannot put M lenses on a DSLR.[1]

Compatibility

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

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 Filter size
11–22 mm 17.6 – 35.2 mm f/4 – 5.6 2013 No No Yes Yes No No 55 mm
15–45 mm 24 – 72 mm f/3.5 – 6.3 2015 No No Yes Yes No No 49 mm
18–55 mm 28.8 – 88 mm f/3.5 – 5.6 2012 No No Yes Yes No No 52 mm
18–150 mm 28.8 – 240 mm f/3.5 – 6.3 2016 No No Yes Yes No No 55 mm
55–200 mm 88 – 320 mm f/4.5 – 6.3 2014 No No Yes Yes No No 52 mm
22 mm 35.2 mm f/2 2012 No No Yes No No No 43 mm
28 mm 45 mm f/3.5 2016 Yes No Yes Yes No No 43 mm
32 mm 51.2 mm f/1.4 2018 No No Yes No No No 43 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

References
  1. http://www.dpreview.com/previews/canon-eos-m/
  2. http://www.usa.canon.com/cusa/about_canon/newsroom/press_releases?pageKeyCode=pressreldetail&docId=0901e0248105d566
  3. https://www.usa.canon.com/internet/portal/us/home/about/newsroom/press-releases/press-release-details/2017/20170829-EOS-M/20170829-EOS-M
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