Whenever and wherever plates are sensitometrically tested, the purpose is usually to find a correct hypersensitisation time for a new batch of emulsion. Using a sensitometer and a densitometer, primary information is measured: Fog level, speed at fixed density and gamma. From them, the astronomer will derive other information such as hypersensitisation time (or baking temperature...) and exposure time, using a rule of thumb, such as “the optimum fog density level is 0.3 diffuse”.
KeywordsPhotographic Plate Large Telescope Detective Quantum Efficiency Schmidt Telescope Monodisperse Emulsion
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