The Nikon D40 is 19.5 mm narrower, 13.8 mm shorter, 9.5 mm thinner and 298 g lighter than the Canon EOS 40D.
| Canon EOS 40D | Nikon D40 | |
|---|---|---|
| Size (W × H × D) | 145.5 × 107.8 × 73.5 mm | 126 × 94 × 64 mm |
| Weight | 822 g | 524 g |
| Lens | Canon EF | Nikon F |
| Sensor | APS-C | — |
| Announced | 2007 | 2006 |