Can the ExpoDisc be used for underwater photography?
Use of the ExpoDisc underwater is not recommended. The properties of light underwater are significantly different than light in the Earth’s atmosphere. Major factors influencing light underwater are: the attenuation of light as depth increases; the scattering of light from suspended particles; and, most importantly, reduced color saturation. At a depth of just 20 feet (6 meters) almost all red light has been filtered out by the water. Without special lights, underwater photography using natural light is only possible in very clear water at shallow depths of just a few feet. The ExpoDisc was not designed to address these issues. CAUTION: The dyes in the special filters used to manufacture the ExpoDisc could be affected by immersion in water or other liquids. Salt water, in particular, is very caustic and could severely damage the ExpoDisc. The ExpoDisc Limited Warranty is void if the filter has been immersed in liquids.
