Use these lens for shallow snorkeling in Hawaii. Attached to GoPro Hero 7 black. After the first use fogged up about 20 minutes after being out of the water. Removed the lens and dried everything out. Use twice more without fogging. Reviewing the video between the magenta lens and the clear lens is subtle buts makes enough of a difference to make the lens worth the purchase. Look forward to using them again. Like not having to but the camera in a plastic box to go underwater.