Since the development of the Aqualung by Jacques Cousteau and Emil Gagnan in 1943, we have been able to stay underwater safely and comfortably for extended periods of time. This amazing technological breakthrough allows us to discover, explore, and photograph the wonders of the underwater world. It was one of the first challenges underwater pioneers, such as Cousteau, faced was capturing the beauty and mystique of this foreign world on film in order to share it
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looking through five glass interfaces: the face mask, the viewing window in the waterproof camera housing, the viewfinder of the camera in the housing, the lens, and finally the window on the other side of the housing through which the lens sees the subject. The generally low levels of light underwater further complicate these problems.
All information gathered from various Internet sources and Underwater Photography by Charles Seaborn published by Amphoto, New York, New York. 1988.