I have an Carl Zeiss Jena Sonnar 1:2 50mm T Lens that I bought in a lot of camera equipment. It appears to be an range finder mount, see pics. The glass is scratch free but will need to be cleaned internally. There is a light spider like webbing that should be able to be removed and there are some specks in the glass that appear to be bubbles. I would think the lens could be used as is, but I am not to picky. As I said it has the internal webbing mostly around the internal outer elements. The lens can be taken apart with the right tools from what I can see. The aperture blades move freely and smoothly and are oil free. How about 105.00 shipped/insured (CONUS ONLY) and sold "AS IS". My price seems to be way below what they go for, but why let it sit if someone can use it. PM Me directly if interested please. Thanks, Mike.