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1.2m Schmidt Telescope 356mm glass plate accepted original negative Atlas film copies Atlas film negatives bad contact clean air station Contact Printing copy emulsion copy plates copying gamma copying procedure copying process density of 1.5 different original sky distributed to purchasers dynamic range Edinburgh ESO Sky Atlas ESO/SRC Faults introduced film negative copies Film negative density IllaJ intermediate positive copies Intermediate positive density K.P. Tritton Kodak large numbers light tunnel loss of definition negative film copies negative to intermediate Original negative density Original negative plates original plates original sky densities Plate copying plates see Paper production quality control Representative copying curves reproduce retained at Siding ROYAL OBSERVATORY sent to ESO Siding Spring Observatory Sky Atlas Laboratory sky background density Southern Sky Survey standard density Standen and K.P. straight characteristic curve three intermediate positive UK 1.2m Schmidt UKSTU vacuum plateholder Versamat visual inspection West and Dumoulin x 356mm glass