Port of Toronto - Canon 7D & Vivitar 24mm f2.0 AI Mount. Larger.New addition to the Vivitar family. This Vivitar 24mm f2.0 has the Nikon AI mount, made by Kiron. This lens should be identical to my Kiron 24mm f2.0 (OM Mount), but I compared them side by side and the coating is definitely different.. Both are great, sharp lenses. Also have the Vivitar 24mm f2.0 in PK Mount. The PK version looks closer to the Kiron in terms of coating, as well as focusing. Both the Kiron and the PK mount 24mm f2.0 have the very short focusing travel, whereas the Nikon AI version has longer focusing travel. All of them share the same filter size of 55mm.