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. It has an 18mm flange focal distance (compared to 44mm for EF and EF-S lenses), though 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.
Since 2014 some manufacturers have started producing compatible third-party lenses.
List of EF-M lenses
|Focal length||Effective focal length
(×1.6 crop factor)
|Aperture range||Introduced||Macro||USM||STM||IS||L-series||DO||Filter size|
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