Thank you for viewing. Although listed as X mount, this is an M42 mount. I used it with a FUJIFILM GFX, but I am selling it due to a lens replacement. The early model of the popular old lens ASAHI SUPER TAKUMA 55mm F1.8 is very rare, making it a collector's item. I actually used it with a medium format camera, the GFX100S, and it produced photos with the characteristic flavor of old lenses without vignetting, so I highly recommend it. A 28mm f3.5 (later model) is also included in the set, so with these two lenses, you can enjoy the taste of old lenses from wide-angle to standard range without vignetting on a full-frame camera. The exterior has scratches and scuffs, but there are no noticeable dents. There is some fine dust inside the lens, but it is in relatively clean condition. No mold is visible. Included items: ・Front cap ・Rear cap ・Lens filter ・Lens hood Please check the condition of the product in the photos. Since this is a used item, we do not accept returns or complaints after purchase. Thank you for your understanding.