| Year | 1975 |
| Lens Groups | 8 |
| Lens Element | 9 |
| Aperature Blades | 8 |
| Minimum Aperture | f/22 |
| Closest Focusing | 0.3 m |
| Max. Magnifcation | 1:7.4 (0.135x) |
| Filter Size | 55 mm |
| Diameter x Length | 66 x 61 mm |
| Weight | 343 gr (0.76 lb) |
| Hood | BW-55B |
Solid lens.. Sharpe for its age .. nice dof ... I like the softest in the corners and edges , but that night be for everyone ... good build , pretty light weight .. a fine wide lens... this has been used on a 6d and A7 ... IMAGES can be found on 500px guy Butterworth ..
Used this lens on NEX 5N camera. It's a very sharp lens with low distortions, very useable at F2.0, though the difference between 2.8 and 2.0 is quite noticeable -- it loses contrast and resolution and more prone to flare with some CA when fully open. At 2.8 this lens is already perfect. Good and even resolution the corners. This lens is noticeably better than FD 24/2.8 or FD 28/2.8 at every F stop.
This is possibly the best wide angle FD lens I own (among 17/4, 20/2.8, 24/2.8, 35/2.0, 35/2.8). It has beautiful IQ, colours, barely any CA. This is the only FD wide angle lens besides my 24/2.8 which performs awsome even when wide open.
This lens is made for film cameras, but it performs great also on the m4/3 bodies. I didn't try it on the NEX. This was state-of-art optics in its time, compared to such lenses of 2012 its overall performance still reachs nearly 90%, what is quite impressive.