Word: summarizing
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Dates: during 1930-1939
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Cameraman McAvoy used a Leica camera with a Summar f2 lens, worked with the lens wide open at one-eighth second speed. His film was Du Pont Superior panchromatic, hypersensitized to half again its rated speed by exposing it to fumes of the strongest ammonia obtainable in a closed box for four minutes. Caution to novices: Film so treated should be used within eight hours. After that period it will not only lose its extra sensitivity, but may deteriorate below its original condition...