The Nikon D3100 is 34 mm narrower, 67.6 mm shorter, 7.7 mm thinner and 705 g lighter than the Canon EOS-1D X.
| Canon EOS-1D X | Nikon D3100 | |
|---|---|---|
| Size (W × H × D) | 158 × 163.6 × 82.7 mm | 124 × 96 × 75 mm |
| Weight | 1,210 g | 505 g |
| Lens | Canon EF | Nikon F |
| Sensor | Full frame | — |
| Announced | 2011 | 2010 |