Andoer Polarizer Underwater Diving UV Lens Filter for GoPro Hero3+ Red [Camera] This filter is designed for diving fans who like taking photos and videos under water for Gopro 3+. 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. Directly use on the Waterproof lens cover ,very convenient. Yellow: in tropical waters, in the morning, shoal water,and on the blue water, you can correct the white balance, and effectively improve the shot quality: Red: the depth of 10-20 metres, around noon ( Sun beat down upon the water ) you can use red, smoke filters, aimed primarily at restoring water absorbs Red. Red: the depth of 10-20 meters, around noon (Sun beat down upon the water) you can use red, smoke filters, aimed primarily at restoring water absorbs Red.