Abstract
VARIOUS methods have been used for increasing the sensitivity of photographic emulsions prior to exposure in the telescope. For example, washing red sensitive (panchromatic) emulsions in ammonia or water, and latterly baking blue sensitive (orthochromatic) emulsions at 50° C have given reductions in the exposure times required to reach a given density, although at the cost of greater intrinsic fog and non-uniformities, and poorer photometric properties. More recently, placing the photographic plates in vacuum for several hours, with or without simultaneous baking, has come into common use for some emulsions, and this has been followed by baking in a dry nitrogen atmosphere (see ref. 1 and references therein).
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References
Hoag, A. A., and Schoening, W. E., Emulsion Bake Tests, (Kitt Peak National Observatory preprint, 1973).
Walker, M. F., Astrophys. J., 161, 835 (1970).
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CORBEN, P., REDDISH, V. & SIM, M. Speeding up astronomical photography. Nature 249, 22–24 (1974). https://doi.org/10.1038/249022a0
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DOI: https://doi.org/10.1038/249022a0
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