RF400mm f/2.8L IS USM
| Angle of View (Diagonal) | 06°10′ |
| Angle of View (Horizontal) | 05°10′ |
| Angle of View (Vertical) | 03°30′ |
| Closest Focusing Distance (m, ft) | 2.5 / 8.20 |
| Construction (Groups Elements) | 13,17 |
| Diameter x Length | 163 x 367 |
| Distance Scale | - |
| Drive System | Ring USM |
| Filter Size | 52 (Drop-in) |
| Maximum Magnification (x) | 0.17 |
| Minimum Aperture | 32 |
| Number of Diaphragm Blades | 9 |
| Anti-dust and Moisture | Supported |
| Weight | 2890 |
| Accessories (Lens Cap) | E-180E |
| Accessories (Lens Hood) | ET-155 (WIII) (bundled) / ET-155B (sold separately) |
| Accessories (Lens Bag) | LS400 |