High-fidelity copying of large-area astronomical plates - Principles and some practical results

Statistics – Applications

Scientific paper

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Astrometry, Astronomical Photography, Photographic Plates, Schmidt Telescopes, Astronomical Photometry, Photogrammetry

Scientific paper

An investigation into the achieved fidelity of copies of a large Schmidt telescope plate is reported. Atlas quality copies both on glass and film and the original are compared. Two glass copies made through different intermediate positives are used to look at the fidelity of the separate positives. The general belief that glass copies are capable of impeccable photogrammetric quality is confirmed. However, film copies are shown to achieve essentially the same astrometric fidelity. The general feeling that for photometric applications film copies should be equivalent to glass ones is not confirmed. It is found that glass copies are generally better in densitometry.

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