| Year | 1960 |
| Lens Groups | 4 |
| Lens Element | 5 |
| Aperature Blades | - |
| Minimum Aperture | f/22 |
| Closest Focusing | 3.1 m |
| Max. Magnifcation | 1:7.7 (0.13x) * |
| Filter Size | 48 mm |
| Diameter x Length | 100 x 208.4 |
| Weight | 1700 gr (3.75 lb) |
| Hood | - |
| Beefiness | 1.04 |
Photos tagged for the Canon R 400mm f/4.5 in the Canon Classics Flickr Group.