EF400mm f/4 DO IS II USM
| Angle of View (Diagonal) | 6°10’ |
| Angle of View (Horizontal) | 5°10’ |
| Angle of View (Vertical) | 3°30’ |
| Closest Focusing Distance (m, ft) | 3.3/10.83 |
| Construction (Groups Elements) | 12-18 |
| Diameter x Length (mm) (Approx.) | 128 x 232.7 |
| Distance Scale | o |
| Drive System | Ring-type USM |
| Filter Size (mm) | 52 |
| Max. Magnification (x) | 0.13 |
| Min. Aperture | 32 |
| No. of Diaphragm Blades | 9 |
| Anti-dust and Moisture | Supported |
| Weight (g) (Approx.) | 2100 |
| Accessories (Lens Cap) | E-145C |
| Accessories (Lens Hood) | ET-120 (WII) |
| Accessories (Lens Bag) | Lens Case 400D |