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Sunday Times Concise
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20 DOWN: Film speed unit: D?N
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a formerly used logarithmic expression of the speed of a photographic film, plate, etc, given as –10log10 E, where E is the exposure of a point 0.1 density units above the fog level; high-speed films have high numbers http:// www.col linsdic tionary .com/di ctionar y/engli sh/din
a formerly used logarithmic expression of the speed of a photographic film, plate, etc, given as –10log10 E, where E is the exposure of a point 0.1 density units above the fog level; high-speed films have high numbers http://