Object: M17 Omega Nebula Optic: NON1000 (200/1000mm Newton f5), GPU Corrector Mount: Skywatcher AZ-EQ6 Camera: ZWO ASI 1600MM-C @ -20°C, Gain 75, Offset 15 Filter: ZWO EFW 7x36mm, Baader 36mm Filter Exposure: total 6.1h, L 32x4min + 11x4min from RGB, R 11x4min, G 11x4min, B 12x4min, Ha 25x4min 327xBias, 48x Darks, 31x Flat(L:R:G:B) Color: L-RGB Capture: SGP (Sequencing, Autofocus, Dithering, FlatWizard) Guiding: TS-OAG 9mm, ASI120MM, PHD2 Date1/Location1: 2015-06-24, Kreben, BA200 GPU Date2/Location2: 2015-07-10, Vockenroth, BA200 GPU Date3/Location3: 2017-08-21, Austria Date4/Location4: 2017-08-23, Austria Image Processing: Pixinsight: BatchPreprocessingScript (calibrate only), CosmeticCorrection, StarAlignment, Blink, ImageIntegration, ChannelCombination, DBE for RGB, MaskedStretch, STF-Stretch for RGB, MaskedStretch for L, LRGBCombination, Registration of Ha Data from 2015 PS: Blend of Ha-Data with AdjustmentLayer Lighten, maskedMinimumFilter, ColorBalance, Levels, Dynamic final Tweaks |