37mm Gopro CPL Filter Circular Polarizer Lens Filter for Gopro Hero3+ / Hero3 37mm CPL Filter Circular Polarizer Lens Filter for Gopro Hero3+ / Hero3 37mm CPL Circular Polarizer Lens UV Filter + Cap For Gopro Hero 3 3+ 37mm CPL Filter Circular Polarizer Lens Filter with Cap for GoPro Hero 3 / 3+ Installation: Just simply put the UV / CPL filter on Lens. Make sure the filter hold on the lens secure. Don't put the filter too hard into the lens. Lens cover fits for the filter only. The CPL filter has a ring to control the polarizer glass to manage reflections, or suppress glare. When the polarizer axis is perpendicular to the polarization of the light from the screen, no light passes through. Specification Compatible Brand: Gopro Compatible Models: Hero3+/Hero3 Lens Diameter:37mm Anti-Shake:No Viewing Angle:135~170กใ Focal Distance:0 cm Material: Glass ,Aluminum Alloy Packing List 1 x Filter 1 x Cap