This lens is for the old Contax RF mount (inner bayonet). Please note that it is not for the Yashica Contax mount. Since this lens does not have a focus ring, you can use it with a mirrorless camera via a helicoid adapter, or directly on a rangefinder camera. The body has a silver sheen and is in relatively good condition for an old lens. There is no mold or haze visible in the lens. This lens has been disassembled and cleaned, and dust has been removed as much as possible, but due to the structure, dust is likely to enter, and there may be some minor dust particles present. This is minor and should not affect the image quality. Because there are very few of the light cleaning marks and coating scratches typical of Jupiter lenses, we have categorized it as a beautiful item. The aperture ring moves normally. No returns or exchanges accepted. Beautiful item, disassembled and cleaned, Jupiter-8M 50mm f2, old Contax RF mount (inner bayonet), Contax Ikon, Contax RF