| Year | 1960 |
| Lens Groups | 4 |
| Lens Element | 5 |
| Aperature Blades | - |
| Minimum Aperture | f/22 |
| Closest Focusing | 1.5 m |
| Max. Magnifcation | 1:5 (0.2x) * |
| Filter Size | 48 mm |
| Diameter x Length | 91 x 135.4 |
| Weight | 1200 gr (2.65 lb) |
| Hood | - |
| Beefiness | 1.36 |
Photos tagged for the Canon R 300mm f/4 in the Canon Classics Flickr Group.