Pacman Nebula in DSLR H-alpha

[themos]

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...

Edited September 18, 2016 by themos
added info

[ollypenrice]

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