UV filter protects your camera lens from damage. OPTICS, Optical Glass Filter with metal ring. Ultraviolet filters absorb UV light generally without affecting light in the visible region thereby reducing or eliminating distortion A UV filter serves to protect your lens from all dust, dirt, scratches and fingerprints. Polarizer filter eliminated unwanted color reflection from sun or bright light, increases color saturation, enhances contrast ratio. Fluorescent Filter (FLD) reduces reflection in fluorescent light.