This is a single-focus lens, the VK50R 5cm F4.5, made by Kiyohara Optical. It's the second generation of the so-called Kiyohara Soft lens. Unlike the first generation VK70R, this lens can be used as a standard 50mm lens on full-frame cameras. It's an interesting lens that allows you to experience the image quality of a Bessar lens with 35mm film or digital camera bodies. It has a Leica R mount. The mount can be changed with dedicated parts. ☆ All functions have been confirmed to work. ◎ Regarding the exterior, there may be some minor scratches on the lens barrel, but no noticeable scratches were found, and it's in surprisingly beautiful condition considering its age. ⇛ I believe it's a beautiful item. ◎ Regarding the optics, there may be very fine dust particles due to it being an old lens, but there was no mold or clouding that would cause problems in actual shooting. It's in surprisingly beautiful condition considering its age. ⇛ I believe it's in good condition. ◎ A metal front cap, which was included at the time of purchase, will be included. It's unknown whether it's genuine. ☆ Even among Kiyohara Soft lenses, the VK70R is occasionally seen on the market, but the VK50R is a very rare lens that is rarely seen. The Leica R mount version is even rarer. ☆ The lens mount can sometimes be loose. I didn't notice it during use, but due to the structure, if the mount screws loosen during transportation, please tighten them before use. 50mm KIYOHARA SOFT VK50R