ITEM NAME:Optical Glass Split Polarizing Filter CPL Lens for GoPro Hero 37mm Camera Description: Fits for Gopro Hero 3/3+/4 Camera lens with 40.5mm thread. Influence the clarity and expressiveness. Eliminate the reflected light, eliminating the light from the surface of the water or glass and other glossy reflection. Increase the color saturation, can make the blue sky, green leaves, ridge and architecture and other colors more vivid. Circular Polarization CPL is dedicated to AF focus cameras and digital. Specification: Material: Glass+Plastic+Aluminum alloy Filter diameter: 37mm Thickness: 18mm Scope: GOPRO 3/3+/4 Package Includes: 1x CPL Filter Note: camera is not included..Scope: GOPRO 3/3+/4. 1x CPL Filter. Eliminate the reflected light, eliminating the light from the surface of the water or glass and other glossy reflection. Material: Glass+Plastic+Aluminum alloy. Increase the color saturation, can make the blue sky, green leaves, ridge and architecture and other colors more vivid.