The Olympus OM-D E-M5 Mark III is 20.7 mm narrower, 37.8 mm shorter, 31.8 mm thinner and 566 g lighter than the Nikon D810.
| Nikon D810 | Olympus OM-D E-M5 Mark III | |
|---|---|---|
| Size (W × H × D) | 146 × 123 × 81.5 mm | 125.3 × 85.2 × 49.7 mm |
| Weight | 980 g | 414 g |
| Lens | Nikon F | Micro Four Thirds |
| Sensor | — | Four Thirds |
| Announced | 2014 | 2019 |