Rare, Serviced MTO500 / 3M-5A / 3M-5CA / ZM-5A 500mm F8 Soviet Mirror Lens M42 Mount This is a very rare Soviet mirror lens. It is an M42 mount lens. The body has some scratches, but I think it is in quite good condition for an old Russian lens. It is difficult to find one in such good condition in Japan. This lens has been disassembled and cleaned, and dust has been removed as much as possible. Due to the structure, dust is likely to enter, and there may be some minor dust particles, but they are minor and do not affect the image quality. The focus ring has also been greased, so it moves smoothly. Front and rear caps, a case, and filters are included. The filters show some scratches.