The GoScope Red Filter offers amazing color correction in Tropical Water. The filter securely snaps onto your camera. The filter can be used to correct the colors between 15 and 90 feet under water. GoScope has logged over 200 engineering man hours of R&D to ensure the optimum color correction. Check out the example pictures and notice the difference with and without the GoScope Red Filter! The Magic of the Red Filter: When filming below 15 feet of water the wavelength of red light disappears. The red filter corrects for the loss of the red light wavelength resulting in a more true representation of color. Optimum Color Correction Many hours of testing and design have gone into the exact coloration of the red tint. The bluish/green washed out affect that are normally recorded by your action camera will be replaced by vivid colors matching what you see under water.