Photographic recording at large telescopes

Details Photographic recording at large telescopes Photographic recording at large telescopes

Jul 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974rpnl.conf..309m&link_type=abstract

In European Southern Obs. Res. Programmes for the New Large Telescopes p 309-319 (SEE N75-15523 06-89)

Astronomy and Astrophysics

Astronomy

1

Astronomical Photography, Photographic Plates, Signal To Noise Ratios, Telescopes, Gas Flow, Heat Treatment, High Resolution, Image Enhancement, Nitrogen, Photosensitivity, Vacuum

Scientific paper

Recent advances in photographic detection of faint signals are reviewed to capitalize on the high resolution wide field capability of the four meter class telescopes. Faint signals with high signal to noise ratios are best detected with fast sensitive films or with careful use of a pre-flash with fast plates. It is shown that if the signal to noise ratio is low, long exposures are needed. To reduce exposure time, plate baking in a slowly moving stream of dry nitrogen or in a vacuum have produced hypersensitizing effects.

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