NGC891: Galaxy in Andromeda, 42 x 10 minutes, F/10, 10/28/2011. Celestron 8" EdgeHD with Astro-Physics Mach1GTO GEM. SXVR-M25C. IDAS LPS Filter. Hutech OAG. Lodestar. Pre-Processed (BPM, Bias, Flats Calibration and Debayer) with Nebulosity. Stacked and Post-processed with PixInsight. PHD settings: RA Aggressiveness: 70, RA Hysteresis: 10, Max Dec Duration: 100, Min Motion: 0.60, Calibration Steps: 175msec, Auto/Resist Switching, Dithering: Extreme and Settle < 0.5, 1.0 - 1.5 sec guiding exposure.