The ProMaster Digital HD UV Filter is an extremely high quality UV filter designed to protect your lens and to filter excess ultraviolet light. Constructed with premium Schott optical glass and 12 layers of anti-relective coating, these filters are designed to yield extreme image sharpness. They also feature a precision machined, super slim aluminum frame with anti-reflective matte finish and knurled edges. Click on a filter size below to view its product page:+ Premium Schott optical glass + L39 UV coating + 12 layer anti reflective coating + Precision machined aluminum ring with matte finish and knurled edges.