Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300a (IR-modified). Exposure data: 4 - 10 minute exposures at IS800. Ambient temp ~69°f.
Image capture scale: 0.41 arc-seconds/pixel (i.e., un-binned). Field of view (horizontal) = 24.9 arc-min. Image capture using TSXPro Camera Add On (Software Bisque) via BackyardNikon.
Mount: Orion HDX110 German equatorial mount. Autoguided with an SBIG Sti autoguider, a Celestron OAG (off-axis guider) using PHD2 autoguiding software, not dithered.
Post processing: ImagesPlus 6.5: NEF conversion and calibration, alignment, stacking/combining using 0 dark frames, a 9 bias frame master and 0 flat frames, Min/Max Excluded Average combined,
DDP, noise reduction in ImagesPlus Image Processing 6.5.
Adaptive Richardson-Lucey deconvolution (7x7 by 7 passes) in IP.
Cropped to final dimensions and resized to 50pct. Final image scale/resolution 0.82 as/p.
Seeing: FWHM: 2.68 pixels, 2.19 arcseconds (per TSXPro ImageLink).
20170521_M27_CombExcAvg-IPddparl-TPcrp-IPadj-TPadj.jpg
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