The 25mm Snapshot Skopar is a good lens, it shouldn't matter whether it is in LTM mount or S/C mount. same optics. Can't beat the price now that they are on closeout in S/C mount. Won't be around forever. If I didn't have a 21mm Zeiss Biogon for my Contax/Kiev cameras, I would get one in a heartbeat (in Contax mount). Much better deal than a rare Topogon.