This is an SMC Takumar 28mm f/3.5 lens. I've used it for about two years since I bought it, but I'm selling it because I haven't been using it much lately. I will also include adapters for Nikon F-mount and M42 mount. There are a few scratches on the exterior, but the lens itself is very clean. Please purchase only if you understand that this is a used, vintage lens.