The Canon EOS M is 15.4 mm narrower, 29.5 mm shorter, 42.7 mm thinner and 207 g lighter than the Nikon D3100.
| Nikon D3100 | Canon EOS M | |
|---|---|---|
| Size (W × H × D) | 124 × 96 × 75 mm | 108.6 × 66.5 × 32.3 mm |
| Weight | 505 g | 298 g |
| Lens | Nikon F | Canon EF-M |
| Announced | 2010 | 2012 |