Reduces excessive blue by absorbing almost three quarters of UV light. Best general purpose UV control. Eliminates UV problems from most situations where increased Haze tends to wash out color and image clarity. Protects your camera or camcorder lens against dust, moisture, fingerprints, scratches and damage. Can be kept on your camera at all times. This filter absorbs excess UV light while protecting your lens from dirt and scratches. Film and video are more sensitive to UV light than our eyes are. This often shows up as a bluish cast in images, especially shots from high altitudes and long distances, particularly over water.