Canon EF-M lens mount

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Canon EF/EF-S adapter, 22mm prime lens and 18-55mm standard zoom lens

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. It has an 18mm flange focal distance (compared to 44mm for EF and EF-S) and a 47mm throat diameter (compared to 54mm 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. It allows the use of Canon EF and EF-S lenses with a Canon-made adapter, but it is not backwards-compatible with Canon's existing DSLR cameras.[1]


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

List of EF-M lenses[edit]

Focal length Equivalent focal length
(×1.6 crop factor)
Aperture range Introduced Macro USM STM IS L-series DO Filter size

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

Third-party lenses[edit]

Since 2014 some manufacturers have started producing compatible third-party lenses.[3]