Threshold contrasts for the photographic recording of stars on the sky background

Details Threshold contrasts for the photographic recording of stars on the sky background Threshold contrasts for the photographic recording of stars on the sky background

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980znpfk..25..285b&link_type=abstract

Zhurnal Nauchnoi i Prikladnoi Fotografii i Kinematografii, vol. 25, July-Aug. 1980, p. 285-289. In Russian.

Mathematics

Logic

1

Astronomical Photography, Photographic Film, Photographic Recording, Photosensitivity, Stars, Optical Scanners, Photographic Plates, Sky, Threshold Logic

Scientific paper

A sensitometer was used to determine threshold contrasts for a number of photographic materials as a function of the diameters of optical images of circles; the diameters varied from 13.5 to 375 microns. The threshold contrast rapidly decreases as the diameter increases; at large diameters the contrasts tends to a certain limit. The limit contrasts of various materials differ significantly depending on granularity and other properties.

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