Thank you for viewing. I am selling this item because I have reduced the frequency of use and am organizing my equipment. This is a special sharp-cut filter that can cut UV (ultraviolet) and IR (infrared) light rays that affect image quality. I haven't used it much, but it is a used item, so please refrain from purchasing if you are looking for a perfect condition or are overly concerned about details. (For Search) Circular Filter Kani Filter Telephoto Lens