EF400mm f/5.6L USM
| Angle of View (Diagonal) | 6°10’ |
| Angle of View (Horizontal) | 5°10’ |
| Angle of View (Vertical) | 3°30’ |
| Closest Focusing Distance (m, ft) | 3.5/11.5 |
| Construction (Groups Elements) | 6-7 |
| Diameter x Length (mm) (Approx.) | 90 x 256.5 |
| Distance Scale | o |
| Drive System | Ring-type USM |
| Filter Size (mm) | 77 |
| Max. Magnification (x) | 0.12 |
| Min. Aperture | 32 |
| No. of Diaphragm Blades | 8 |
| Anti-dust and Moisture | Not Supported |
| Weight (g) (Approx.) | 1250 |
| Accessories (Lens Cap) | E-77 II |
| Accessories (Lens Hood) | Built-in |
| Accessories (Lens Bag) | LZ1132 |