The EF-M mount is a lens mount designed in 2012 by Canon for digital mirrorless cameras with APS-C sensors. It is a bayonet mount with three lugs, made exclusively for the APS-C format (1.6× crop factor), with a focal flange distance of 18mm and a throat diameter of 47mm. EF-M mount inherited EF-mount digital-only communication, there are no mechanical linkages between lens and camera, and it is fully compatible with EF and EF-S mount variants, meaning simple adapters with pass-through connections are sufficient to retain all adapted lens functions.
EF-M lenses cannot be used on RF-S cameras due to a shorter focal flange distance.
Note: this reference currently counts only autofocus lenses.
Canon EF-M system was discontinued in October 2023.
Jump to: Canon EF-M lenses, third-party EF-M lenses, adapters.
Canon EF-M lenses
- Canon EF-M 11–22mm F4–5.6 IS STM ~17–35mm-equivalent
- Canon EF-M 15–45mm F3.5–6.3 IS STM ~24–70mm-equivalent
- Canon EF-M 18–55mm F3.5–5.6 IS STM ~30–90mm-equivalent
- Canon EF-M 18–150mm F3.5–6.3 IS STM ~30–240mm-equivalent
- Canon EF-M 22mm F2 STM ~35mm-equivalent, pancake lens
- Canon EF-M 28mm F3.5 Macro IS STM 45mm-equivalent, macro lens
- Canon EF-M 32mm F1.4 STM ~50mm-equivalent
- Canon EF-M 55–200mm F4.5–6.3 IS STM ~90–320mm-equivalent
Third-party EF-M lenses
- Sigma 16mm F1.4 DC DN Contemporary 26mm-equivalent
- Sigma 30mm F1.4 DC DN Contemporary 48mm-equivalent
- Sigma 56mm F1.4 DC DN Contemporary 90mm-equivalent
- Tamron AF 18–200mm F3.5–6.3 Di III VC ~30–320mm-equivalent
- Viltrox AF 23mm F1.4 STM ED IF 37mm-equivalent
- Viltrox AF 33mm F1.4 STM ED IF ~55mm-equivalent
- Viltrox AF 56mm F1.4 STM ED IF 90mm-equivalent
Adapters
Canon offered the official Mount Adapter EF-EOS M that allowed the use of EF and EF-S mount lenses on EF-M mount cameras. It retains full control of lens features like autofocus, aperture and image stabilisation and behaves like a native EF-S camera regarding the crop factor. Some third-party manufacturers, notably Viltrox, produced two different adapters — the standard one, Mount Adapter EF-EOS M, functionally identical to the genuine Canon Mount Adapter EF-EOS M; and Mount Adapter EF-M2 with the same electronic compatibility but functionally similar to a native EF mount camera — a “full frame” model. Its telecompressor (“speed booster”) optics reduces APS-C crop factor by 0.71×, reducing it to effectively 1.136× instead of the standard 1.6×.
| Adapter | AF, aperture, IS | Fixed tripod foot | Detachable tripod foot | Crop factor | Speed booster |
|---|---|---|---|---|---|
| Canon Mount Adapter EF-EOS M | ✅ | ❌ | ✅ | 1.6× | ❌ |
| Viltrox Mount Adapter EF-EOS M | ✅ | ❌ | ✅ | 1.6× | ❌ |
| Viltrox Mount Adapter EF-M2 | ✅ | ✅ | ❌ | 1.136× | ✅ |
| K&F Concept EF-EOSM II AF | ✅ | ✅ | ❌ | 1.6× | ❌ |
References
Last update: 9. 4. 2026.