For sale is an extremely rare M42 mount LOMO KO-140M 140mm f1.8 lens. It is a Petzval type. This is a very bright lens. Although it has no aperture, it is extremely sharp even wide open. Originally, this was an old lens used as a projection lens or cine lens without a focus ring. This lens has been customized with a focus ring (extension helicoid) and is adapted for use with an M42 mount. Infinity focus is of course achievable, but it has been adjusted slightly beyond infinity to provide some leeway. It can be used directly with M42 mount cameras. For other mount cameras, please use an M42 mount adapter. The closest focusing distance is approximately 70cm. There are not many scratches, and it appears to be in good condition for an old Russian lens. There is no mold or fogging inside the lens. This lens has been disassembled and cleaned, and dust has been removed as much as possible, but due to the structure, dust can easily enter, and there may be some minor dust particles. This is minor and does not affect the image quality. There may be some wiping marks or coating scratches on the lens surface, which are characteristic of this lens, but they are minor and do not affect the image quality. Overall, I believe this lens is in good condition. Disassembled and cleaned. Ultra-rare LOMO KO-140M 140mm f1.8 Petzval M42 old lens, single-focus cine lens.