This is a Schneider-Kreuznach Componon-S 50mm F2.8 "M-mount modified" (modified by Kouten Koubou). The mount is Leica M-mount. According to the person in charge at Kouten Koubou, they are currently not receiving any stock of this 50mm F2.8. It is known for its excellent image quality, and like the 45mm, it takes great pictures, so it is recommended for those looking for a slightly brighter lens. It is a model that photographer Keita Haginiwa also introduced. Rather than buying an expensive Leica genuine lens, this one offers better cost performance and allows you to enjoy the image quality. If you are looking for one, please consider it. ◯Condition Optics and rangefinder coupling are in good working order. There are paint scratches from attaching a filter (blue circle). There were some minor scratches on the exterior from the time of purchase. ◯Accessories ・Box ・Order number required for adjustment at Kouten Koubou ・Lens body: Approximately ¥90,000 ・Lens hood (black): Approximately ¥8,000 ・NiSi Armor FX 40.5mm: Approximately ¥8,000 From the official website: This is a modified lens that allows the Schneider (Germany) industrial lens "Componon-S 2.8/50-0018 V-Mount Macro" to be used with M-mount cameras. You can enjoy the high-quality metal lens barrel that operates smoothly and the optical performance that meets the high standards of industrial applications. Excellent close-up shooting performance The Componon-S 2.8/50 used for the modification is a high-resolution industrial lens used in machine vision, printed circuit board inspection, and liquid crystal/organic EL display inspection. While conventional lenses show a decline in optical performance as the shooting magnification increases, this lens is designed and corrected to exhibit high descriptive performance in close-up shooting from a shooting magnification of 1:20 to 1:1. High-quality lens barrel The lens barrel is manufactured and customized at an OEM factory that is particularly known for its quality among the affiliated factories of Kouten Koubou (SHOTEN brand). The silver metal lens barrel, which stands out for its high processing accuracy, has a smooth operating feel and a classic and sophisticated appearance, giving you the pleasure of owning it.