DaveS Posted October 23, 2017 Share Posted October 23, 2017 Well, I doubt if I'll get more data on this before the close date so I'm posting anyway. NGC 281, the Pacman Nebula in Cassiopeia, in NHO pallette using my 130mm f/7 photoline triplet and 0.75x APM / Riccardi reducer, 3nm Astrodon filters and SX694 camera. [NII] and HII 12x10 min subs, [OIII] 18x10 min subs, encoder guided on ASA DDM60 mount. Capture with Maxim DL also used for plate solving processing in AstroArt 5 Each set of subs stacked with Sigma Add and only Bias calibration followed by Gradient Reduction > Adaptive Divide. After RGB synthesis with [NII] assigned to red, HII to green and [OIII] to blue the alignment borders were cropped off and another round of Gradient Reduction > Adaptive Subtract applied. Several rounds of Histogram Stretch were applied with Gradient Reduction and White Balance in between each iteration. Finally the saturation was given a slight boost before a last round of Gradient Reduction, White Balance and Histogram Stretch. I *still* haven't got enough data, but it seems unlikely that I will have now. If the sky miraculously clears and I manage to gather more and process it before the close data I'll update this image, else it will have to stand. Link to comment Share on other sites More sharing options...
TSRobot Posted October 23, 2017 Share Posted October 23, 2017 Hi. I know little of darks, flats, subs and AP talk, but thanks for the amazing picture and the time you spent on it ? Link to comment Share on other sites More sharing options...
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