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NGC 6618 - Swan Nebula Date/time: 11.08.2010 23:05 to 12.08.2010 00:55 Az./Alt. positions: 193° / 29° to 220° / 20° Ambient conditions: 20°C, transparency 5/5, seeing 5/5 Location: Villa Tatti, Tuscany, Italy Equipment: Telescope: Deltagraph 300mm f/3.3 Mount: CGE Camera: SXVF-M25C Guiding scope: Orion short tube 80mm f/5 Guiding camera: ATIK 16IC Filters: IDAS LPS Acquisition: Software: Maxim DL 5 FOV, Image scale: 62.5 x 54.8 arcmin, 1.62 arcs/pixel Sub-exposures: 51 min (17 x 3 min) light frames No darks, 100 bias, 50x0.2s flats Processing: Images Plus 3.75: Calibration of light frames with bias and flats, Deconvolution Maxim DL: Stacking of calibrated frames with SDMask, color balance R85:G100:B120 CS3: Stretching with Curves and Levels, noise reduction with Carbonis Actions Comments: Even if this night was exceptionally good, M17 was immersed in the humid and light polluted south area. I had problems with tracking, clearly visible in the final image.
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