M13, Globular Cluster in Hercules. 5/24/2014. TEC 140 APO F/7. QSI660wsg. Luminance Filter. Superstar autoguider. 12 x 3 minutes binned 1x1. Total 36 minutes. Sequence Generator Pro for Auto Focusing, works better than Bahtinov mask (See next image used with Bahtinov mask). Pre-Processed (BPM, Bias, Flats Calibration) with Nebulosity. Stacked and Post-processed with PixInsight. PHD settings: RA Aggressivemess: 60, RA Hysteresis: 10, RA Max Duration: 1000, Dec Max Duration: 1000, Min Motion: 0.50, Calibration Steps: 150msec, Auto/Resist Switching, Dithering: High and Settle < 0.5, 5 sec guiding exposure.