Nebulae - PeterNagy
NGC7635: Bubble Nebula in  Cassiopeia, Astrodon Oiii 5nm filter, 31 x 15 minutes, Unbinned 1x1. F/10, 9/7/2012. Seeing condition was bad.

Celestron 8" EdgeHD with Astro-Physics Mach1GTO GEM. Atik 460EX mono. Hutech OAG. Lodestar. 

Captured and pre-processed with Nebulosity. Stacked and stretched 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, 4 sec guiding exposure.

NGC7635: Bubble Nebula in Cassiopeia, Astrodon Oiii 5nm filter, 31 x 15 minutes, Unbinned 1x1. F/10, 9/7/2012. Seeing condition was bad.

Celestron 8" EdgeHD with Astro-Physics Mach1GTO GEM. Atik 460EX mono. Hutech OAG. Lodestar.

Captured and pre-processed with Nebulosity. Stacked and stretched 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, 4 sec guiding exposure.