The UV filter cuts off unwanted ultraviolet rays, reduces haze and increases clarity. In addition, the UV filter serves very well as a protective glass for the lens. The key parts, multi-coated filters greatly reduce the occurrence of stray light and ghosting caused by reflections. Black Almit Frame. Filters feature a black matte aluminum frame with a satin almit finish that reduces reflections. Knurled edge frame these filters feature a straight knurled edge for non-slip, easy attachment and removal. The filter housings are UV protected to further extend filter life.