themos Posted September 18, 2016 Share Posted September 18, 2016 The Pacman Nebula in Cassiopeia (NGC 281). Captured with APT, Canon DSLR, Baader coma corrector, Hα filter, .25m f/4 reflector, at ISO800, 19x600sec exposures. Guided with PHD2, finderscope, Atik16ic. Registered and stacked in Iris, processed in PixInsight, no calibration frames. The last 5 exposures were taken in a sky with no naked-eye stars visible (due to thickening high cloud) and the first 6 were badly focused! So definitely a session to learn from... Link to comment Share on other sites More sharing options...
ollypenrice Posted September 18, 2016 Share Posted September 18, 2016 Nice to see you on this part of the forum. Have you compared a stack without the dodgy sub exposures to compare with the full stack? Olly Link to comment Share on other sites More sharing options...
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