The Intova 87.5mm Red Underwater Color Correction Filter for Wide-Angle Lens restores red color to your underwater wide-angle photography. The color red only carries 15-20' (4.6 - 6.1 m) underwater. At depths below this, the color becomes washed out by the filtering effect of the ocean. This filter puts the red spectrum back into your underwater wide-angle images. It is compatible with underwater housings that accept the 87.5mm filter thread.