Untouched jpeg taken at f8. Click for full size This lens is very sharp and not easy to find. It took me all summer to get a good copy. If you search Ebay you see a lot of the Kiron-made 28/2s but they don't say "close focus" on them and are not as good. The Komine-made copies have serial numbers beginning in 28~. If the guy knows what he has he'll sell the lens for $300 but you might get lucky and get it cheaper. I've seen it in Pentax, Minolta, Olympus OM, and Canon FD mounts. Pentax is most expensive, Canon FD easiest to find. Wide open the lens is totally useable. At f2.2 it's good and very good at f2.8. When you hit f5.6 it's simply amazing. I haven't had a chance to go out and shoot macro with it or anything but if the 28/2.8 close focus thread is any indication it's going to be fun! I'm sure I'll be posting more in the future. And some comparisons of different apertures: f2.0, f2.2, f2.8, f4.0, f5.6, f8.0 Vivitar | 28MM 1:2.0 | MC | CLOSE FOCUS WIDE ANGLE | NO. 28xxxxxx | Ø49MM FILTER manufacturer: Komine filter: 49mm markings: green meter scale optics: 8 elements in 7 groups full focus range: 3/4 turn front element turns: no aperture blades: 6 aperture range: f/2-f/16 (with half stops) minimum focus: 23cm maximum magnification: 1:5 weight: 280g diameter / length: 64mm / 43-55mm (48.5mm official) year: 1983?