NGC6888, The Crescent Nebula in Cygnus


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Exposure Data: 9/14/2003.  RRGB: 15x7m, 5x7m, 5x7m, GB 2x2. -10C, 0.74 arc-sec./pixel.
Processing: Acquired via Sequencer and CCDSoft, reduced and aligned, in Mira, RL 2x CCDSharp, RGB combine and DDP in Maxim, LRGB combine, curves, levels and other processing in Photoshop.
Optical System: 12.5 Ritchey-Chretien RCOS Truss @ F/6, ST-10XME NABG/CFW-8A CCD camera, Paramount ME.  Guided by STV/FSQ-106
Comments: Average FWHM was 2.3 arc-sec.