11 - 300 second exposures with the SBIG ST-8300M (monochrome) CCD camera at -20C. No filter. Telescope configuration: EdgeHD 1100 (2800mm, f/10)and no focal reducer, binned 2x2. Image scale of 0.80 arc-seconds/pixel. Mount: Losmandy G11 w/Gemini. Focused using a Bahtinov focus mask. Post processing: dark frame subtraction, alignment, min/max excluded average combining in ImagesPlus 4.0 using 15 dark frames, no bias frames and no flat frames; DDP and curves in Nebulosity2. Adaptive Richardson-Lucy Deconvolution in ImagesPlus (7x7 10 passes). Gamma boosted and unsharp mask in ThumbsPlus. Autoguided with a Lodestar autoguider connected to a Stellarvue 50mm finderscope and a Televue 2.5x Powermate (in lieu of Barlow) and PHD autoguiding software.
This really needs 10 minute sub-exposures (instead of 5).