NGC7635: HaRGB Bubble Nebula in Cassiopeia. 0.47"/pixel. 8/24/2012 (Ha) and 9/15/2012 (RGB)
Astrodon Ha 5nm: 21 x 15 minutes, 1x1, Excellent seeing condition
Astrodon Red: 8 x 10 minutes, 1x1, Less than ideal seeing condition
Astrodon Green: 8 x 10 minutes, 1x1, Less than ideal seeing condition
Astrodon Blue: 8 x 10 minutes, 1x1, Less than ideal seeing condition
Celestron 8" EdgeHD at F/10 with A-P Mach1GTO GEM. Atik 460EX mono. Hutech OAG. Lodestar.
Captured and pre-processed with Nebulosity. Stacked and post processed with PixInsight.
PHD settings: RA Aggressiveness: 90, RA Hysteresis: 10, Max Dec Duration: 75, Min Motion: 0.70, Calibration Steps: 125msec, Auto/Resist Switching, Extreme dithering and Settled at < 0.5, 3 - 4 sec guiding exposure.
Red = Ha + Red, Green = Green, Blue = Blue