Although it is listed as an X-mount due to the lack of a correct mount, it is actually a QBM mount. It can be used with the Rollei SL35 series, or with a conversion adapter. This listing includes the following: ・Rollei Rolleinar-MC F2.8 28mm QBM The following are comments from a layman's perspective. I would appreciate it if you could make your judgment based on the photos. Appearance: No noticeable dents or scratches. Operation: The helicoid is occasionally a bit stiff, but there are no problems with shooting. Optics: No noticeable problems. Personally, I have never felt any impact on shooting. Made in Japan. This is a valuable wide-angle lens from Rollei of this era. Considering its age, I think it is in good condition. It will be stored in a dehumidified storage box until shipping. The following old lens review site may be helpful: https://allphotolenses.com/lenses/item/c_556.htm How about it for Rollei fans or for old lens photography/collection? *Due to being an old lens, please refrain from returns. Included accessories are the lens body, lens filter, and cap. Cameras etc. are not included. Please refrain from silent price negotiations. Since it is a used item from the time of purchase, please refrain from purchasing if you are sensitive to such things. There are no smokers or pets in the household.