A rare(ish) Canon LTM 50mm/1.5 Sonnar lens. Basically, I don't know why I bought it. Maybe I got carried away because they are so rare. Sonnar is great for colour negs but I shoot only B&W and I have a perfectly fine Planar type Canon LTM 50mm lens. I think I'll shoot a few rolls with it and sell it further to someone who needs it more than I do. I'll take a loss but I'm used to it.