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 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.
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. This solution reportedly works well also with regard to the autofocus, but it takes away the size advantage of the smaller M system.
The system is still limited as Canon has not issued a lot of lenses. There is a considerable lack of native lenses with an open aperture.
In 2014, third party manufacturers started to present their M lenses.
The EF-M lens mount is one of Canons two newly introduced systems for mirrorless cameras, the other one being the RF mount of the full frame Canon R presented in late 2018.
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
|11–22 mm||17.6 – 35.2 mm||f/4 – 5.6||2013||No||No||Yes||Yes||No||No||55 mm|
|15–45 mm||24 – 72 mm||f/3.5 – 6.3||2015||No||No||Yes||Yes||No||No||49 mm|
|18–55 mm||28.8 – 88 mm||f/3.5 – 5.6||2012||No||No||Yes||Yes||No||No||52 mm|
|18–150 mm||28.8 – 240 mm||f/3.5 – 6.3||2016||No||No||Yes||Yes||No||No||55 mm|
|55–200 mm||88 – 320 mm||f/4.5 – 6.3||2014||No||No||Yes||Yes||No||No||52 mm|
|22 mm||35.2 mm||f/2||2012||No||No||Yes||No||No||No||43 mm|
|28 mm||45 mm||f/3.5||2016||Yes||No||Yes||Yes||No||No||43 mm|
|32 mm||51.2 mm||f/1.4||2018||No||No||Yes||No||No||No||43 mm|
EF-M 15–45 mm f/3.5–6.3 IS STM mounted at a EOS M6
EF-M 18–150 mm f/3.5–6.3 IS STM mounted at a EOS M5
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