This is a 52mm SKYLIGHT lens filter, which I used regularly with film cameras to protect the lens and to cut ultraviolet light when shooting in clear, blue sky conditions, preventing a bluish tint. Of course, it can also be used without any problems on lenses for digital cameras. As far as I can see, both the glass surface and the frame are in good condition for a used item, but please check the photos to confirm and assess the condition. It will be sent in a Kenko universal filter case. For those who understand that this is a used item...