CANON 400mm f/4.5 I
| Marketed | September 1956 |
| Original Price | 139,000 yen |
| Lens Construction (group) | 4 |
| Lens Construction (element) | 5 |
| No. of Diaphragm Blades | -- |
| Minimum Aperture | 22 |
| Closest Focusing Distance (m) | 8 |
| Maximum Magnifcation (x) | -- |
| Filter Diameter (mm) | 36.5 |
| Maximum Diameter x Length (mm) | 105 x 296.5 |
| Weight (g) | 4,000 |
