Sunpak 55mm Ultra-Violet FilterImproves contrast and color saturation by reducing the effects of ultraviolet light, atmospheric dust and haze in sunny landscapesCan be used in combination with polarizerCan be used to protect front lens from elementsThreaded mount Length 0.75" Width 3" Height 3.5" Weight 0.14 lbs. Sunpak 55mm Ultra-violet Filter. , Audio, Electronics