GoScope Optical Red Filter for GoPro Hero 3 *Compatible with GoPro Hero3 Standard Housing Only (Not Hero3+) Optimum Blue Water Color Correction. Effective from 15 to 70 feet The filter securely snaps onto the front of the GoPro Hero3 Housing and comes with an optional tether When filming below 15 feet of water the wavelength of red light disappears The GoScope Red Filter offers amazing color correction in Tropical Water