This is a Leidolf Wetzlar Telordon 90mm F4.5 interchangeable single-focal-length lens for Lordomat cameras. It is likely a lens for the Lordomat mount. I was planning to use it with a mirrorless camera, but I haven't had much time for this lens, so I am selling it as part of a decluttering effort. Adapters for Lordomat mount lenses are available from various makers and can likely be purchased online. 3D-printed ones seem to be common. ◯ Regarding the exterior, there are some scratches. Please refrain from purchasing if you are sensitive to the condition, as this is a used item. ◯ Regarding the optics, there appears to be some clouding on the lens, likely on the front group of lenses. In my personal assessment, it doesn't seem to have much impact in a well-lit environment, but the clouding was noticeable when exposed to a strong light source. Otherwise, I did not see any noticeable mold. ☆ The aperture operation has been confirmed, but I do not own a Lordomat, so I could not confirm other detailed operations. Therefore, I am selling it as a junk item. Please order with the expectation that you will receive a lens-shaped object. Lordomat