Canon EF-M lens mount
EF-M lens mount of a Canon EF/EF-S to EF-M adapter mount
|Inner diameter||47 mm|
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.
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 is not backwards-compatible with Canon's full-frame DSLR cameras: this means that you cannot put M lenses on a non-M DSLR.
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||Lens diameter||Lens length||Weight|
|11–22 mm||18 – 35 mm||f/4 – 5.6||2013||No||No||Yes||Yes||No||No||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||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||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||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||52 mm||60.9 mm||86.5 mm||260 g|
|22 mm||35 mm||f/2||2012||No||No||Yes||No||No||No||43 mm||60.9 mm||23.7 mm||105 g|
|28 mm||45 mm||f/3.5||2016||Yes||No||Yes||Yes||No||No||43 mm||60.9 mm||45.5 mm||130 g|
|32 mm||51 mm||f/1.4||2018||No||No||Yes||No||No||No||43 mm||60.9 mm||56.5 mm||235 g|
|Wikimedia Commons has media related to Canon EF-M lenses.|
- "Canon EOS M hands-on preview". DPReview.
- https://www.usa.canon.com/cusa/about_canon/newsroom/press_releases?pageKeyCode=pressreldetail&docId=0901e0248105d566[dead link]
- "Step Up and Explore the Wonders of Photography With the Compact Yet Powerful New Canon EOS M100 Camera". Canon U.S.A., Inc. | Press Release Details.