Canon EF-M lens mount

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.

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.

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 non-M DSLR.