E-League(TM)Gopro 3+/4 Diving Filter,Professional Red Diving Housing Filter Underwater Filter Diving Lens for Gopro Hero3+ Gopro Hero 4 Filters are crafted out of a high optical grade acrylic for maximum sharpness Directly use on the waterproof lens cover ,very convenient Filters snap on and off easily from your GoPro Hero3+ and Hero4 Scuba Housing Case Warming filter changes color temperature.  Neutral density filter will slow down cameras shutter speed allowing you to creatively blur select moving subjects. Due to wave refraction, pictures taken underwater may suffer color distortion. Using this color correction filter, pictures taken under water will be more lively and natural