The Canon EOS 40D is 18.5 mm wider, 11.3 mm taller, 5.2 mm thinner and 262 g heavier than the Nikon D5100.
| Nikon D5100 | Canon EOS 40D | |
|---|---|---|
| Size (W × H × D) | 127 × 96.5 × 78.7 mm | 145.5 × 107.8 × 73.5 mm |
| Weight | 560 g | 822 g |
| Lens | Nikon F | Canon EF |
| Sensor | — | APS-C |
| Announced | 2011 | 2007 |