Speeding up astronomical photography

Details Speeding up astronomical photography Speeding up astronomical photography

May 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974natur.249...22c&link_type=abstract

Nature, Volume 249, Issue 5452, pp. 22-24 (1974).

Physics

13

Scientific paper

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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