This lens is a Nikon F-mount, but it is actually a C/Y mount, also known as a Yashica/Contax mount. ■ Appearance I have cleaned it as much as possible, but there are some unremovable dirt and slight paint剥がれ (peeling). However, considering its age and that it is a used item, I think it is in the category of a beautiful item. Please check the photos for details. ■ Optics It looks very clean to the naked eye, but when exposed to strong light from fluorescent lights or LED lights, there are some traces of mold removal on the front element, and there are a few more wiping scratches on the rear element. This is based on my subjective opinion, so there may be oversights. If you are concerned, please refrain from purchasing. ■ Operation There is no oil stain on the aperture blades. Both the aperture ring and the focusing ring move smoothly. Some people may find the focusing ring a little heavy. Personally, I found it just right for focusing and used it that way. ■ Accessories Generic front cap, Contax rear cap, and a Kenko filter (please consider the filter as a bonus). ※ This is a used item, and it is an old lens from about 50 years ago. If you do not understand the characteristics of old lenses or if you are a perfectionist, please refrain from purchasing as it may lead to trouble.