Orea Nd8 Filter for Gopro Hero3/ 3+ and Hero4 Neutral Density Lens Neutral Density filter is designed for reducing light in bright conditions, as well as reducing the camera's shutter speed. when you need to control the speed (in very bright outdoor environments,OREA ND8 LENS by light microscopy to maintain the desired exposure) To prevent the camera overexposed (when using this camera lens to avoid the smallest aperture or exposure of the case occurred) ND lens does not have any effect on the color of the original object , can also be a true representation of the scene contrast. ( Essentially due to the process, the amount of the color temperature This Orea ND filter snaps securely on and off of the Naked GoPro Hero 3/3+/4