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- W1972377082 abstract "Abstract The faintness of the light received from distant stars, and the long periods of exposure needed in astronomy to attain optimum density in the recorded image, bring to prominence two shortcomings in plates as they arrive from the manufacturer. One is very low quantum efficiency—less than one per cent—in which far too many photons are lost in unproductive events, the other is reciprocity failure in which the optical density of the developed image is not linearly related to the apparent brightness of the object. Post-manufacturing processes, known as hypersensitization, are applied in the observatories to increase plate speed and quantum efficiency and to reduce or eliminate reciprocity failure. Such techniques have revitalized the continued use of the older types of plate and are essential for the application of the new, fine-grain materials which have higher resolving power, but barely acceptable speed before treatment." @default.
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- W1972377082 date "1978-01-01" @default.
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- W1972377082 title "Hypersensitizing processes in astrophotography" @default.
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- W1972377082 doi "https://doi.org/10.1080/00107517808210867" @default.
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