The filter reduces the UV rays so that images are clearer, especially at high altitudes. Since the filter is a neutral color and does not cause loss of light, it is used as a protection for the lens and should always be on it. Protects the lens from scratches, dust, fingerprints, etc. The filter has anti-reflective coatings, one on each side and is made of optical glass having a thickness of only 1 mm. The filter is suitable for conventional cameras and digital, it is black in color. King filters are made in Japan