José J. Chambó
Hyakutake Comet
The 1996 Great Comet three days before its maximum approaching to Earth, with 0.5 magnitude, a 2 degree coma diameter and a blue tail of fluorescent gas of 35 degrees longitude as long as Bootes constellation on wich is placed (the bright star at upper left is Arcturus).
The original chemical photography was obtained during 17 minutes at 800 ASA using a 50 milimeters objective mounted on piggyback on a 8" SCT Meade, and although shown the comet with its great magnificence, also present a strong vigneting and other usual bugs of epoch as a bad pass to positive: a big challenge for its remasterization.
The procedure was: clean the negative and remaster it digitally, to obtain a frameset through a macro against a light box, modify the white balance to neutralize the colour of negative, pass it to positive in PixInsight-LE, then calibrated and stacked in DeepSkyStacker, again with Pix-LE, I processed the image with usual metods, and finally with PSP, masked some scratches and defects of the original negative.
Also into the Blog C O M E T O G R A F I A (in Spanish)
Hyakutake Comet
The 1996 Great Comet three days before its maximum approaching to Earth, with 0.5 magnitude, a 2 degree coma diameter and a blue tail of fluorescent gas of 35 degrees longitude as long as Bootes constellation on wich is placed (the bright star at upper left is Arcturus).
The original chemical photography was obtained during 17 minutes at 800 ASA using a 50 milimeters objective mounted on piggyback on a 8" SCT Meade, and although shown the comet with its great magnificence, also present a strong vigneting and other usual bugs of epoch as a bad pass to positive: a big challenge for its remasterization.
The procedure was: clean the negative and remaster it digitally, to obtain a frameset through a macro against a light box, modify the white balance to neutralize the colour of negative, pass it to positive in PixInsight-LE, then calibrated and stacked in DeepSkyStacker, again with Pix-LE, I processed the image with usual metods, and finally with PSP, masked some scratches and defects of the original negative.
Also into the Blog C O M E T O G R A F I A (in Spanish)