page_title: Canon EF-M lens mount
hierarchical_section_title: Canon EF-M lens mount
caption_attribution_description: English: The EF-M mount of a lens mount adapter by Canon for using EF/EF-S) lenses in an EF-M lens mountDeutsch: Das EF-M Bajonett eines Objektivadapters von Canon für die Verwendung von EF(-S) Objektiven in einem EF-M Bajonett
context_page_description: 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 and a 47 mm throat diameter. As it is designed for use with an APS-C-sized image sensor, it features the same crop factor 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 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 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.
context_section_description: 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.
caption: EF-M lens mount of a Canon EF/EF-S to EF-M adapter mount
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