This Asahi Fisheye-Takumar 17mm f4 is a tiny, tiny full frame fisheye lens- pretty unique. This one is in excellent cosmetic condition, with only very light cosmetic wear. Focusing is smooth, diaphragm moves well, and the built-in filters are good. Some of the element edges have a variant of "Schneideritis," with some edge-of-element artifacts; like classic Schneideritis, it's out of the optical path and won't affect imaging, but it's there. A neat lens. Includes original case.