| Year | 1971 |
| Lens Groups | 4 |
| Lens Element | 6 |
| Aperature Blades | 6 |
| Minimum Aperture | f/16 |
| Closest Focusing | 0.6 m |
| Max. Magnifcation | 1:9.7 (0.103x) |
| Filter Size | 55 mm |
| Diameter x Length | 65 x 44.5 mm |
| Weight | 305 gr (0.67 lb) |
| Hood | BS-55 |
Very surprised at this Len s it’s build quality , results and dof .. this is as good as or better than the ef50mm 1.8m.. can see any negatives. , of course their is the normal imperfections in the images , but., That is why we are buying them surely , that will be expected from a lens this old but other than this , nothing else can be faulted ..
A great lens. Great optics, great results, but in a heavy weight body. No matter, I still consider its heavy build of a great quality.
Note that:
1. It has a 55mm filter diam as stated.
2. In cameras like Canon F-1N you will not be able to see the aperture value in your viewfinder (you need the FDn for that).
It does have 55mm filter, or at least mine does