| Year | 1971 |
| Lens Groups | 4 |
| Lens Element | 5 |
| Aperature Blades | 8 |
| Minimum Aperture | f/32 |
| Closest Focusing | 4.5 m |
| Max. Magnifcation | 1:9 (0.111x) |
| Filter Size | 48 mm |
| Diameter x Length | 108 x 338 |
| Weight | 3890 gr (8.58 lb) |
| Hood | - |
| Beefiness | 1.26 |
Photos tagged for the Canon FL 400mm f/5.6 in the Canon Classics Flickr Group.