|The instruments of deep-sea photography|
Edgerton, H.E. (1967). The instruments of deep-sea photography, in: Hersey, J.B. (Ed.) Deep-sea photography. pp. 47-54
In: Hersey, J.B. (Ed.) (1967). Deep-sea photography. The John Hopkins Oceanographic Studies, 3. The John Hopkins Press: Baltimore. 310 pp., more
In: The John Hopkins Oceanographic Studies. ISSN 0271-2229, more
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Cameras provide a superior means of inspecting the sea floor and other objects of the under-sea world. At great depths special attention must be given to the design of pressure-proof containers, windows, and lighting systems. Containers are usually spherical or cylindrical in shape and made of metals such as steel or aluminum. Lenses ordinarily used in air give a distorted image under water, because a portion of the optical path is through sea water and the thick window of the pressure case. Therefore specially corrected lenses are preferred. Light, at great depths, is provided either by continuous floodlight or by flash units. A typical camera system consists of a light unit combined with a camera ( or two cameras for stereoscopy), and is usually arranged to operate at regular , pre-set intervals. Several different camera assemblies have been designed for the specific interests of various deep-sea research projects.