Three-color astrophotography as a supplement to three-color photometry

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photography, Astronomical Photometry, Color Photography, Photographic Processing, Optical Filters, Photographic Film, Photographic Plates

Scientific paper

Three-color astrophotographic procedures for obtaining natural-color photographs of faint objects such as spiral nebulas are described. The Schwarzschild effect which describes the differences in the exponential rates of photographic-layer darkening for long exposures, is considered, and a combination of film and filters which require 20, 28, and 36 min for blue, green, and red photography is recommended. Means of improving color sensitivity and the choice of associated equipment are discussed.

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