Canon EF-M lens mount

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Canon EF/EF-S to EF-M adapter mount, 22 mm EF-M prime lens and 18-55 mm EF-M standard zoom lens

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.[1] 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 many native 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[edit]

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


See also[edit]