Distance: 20.9 ± 1.8 Mly

Telescope configuration: Celestron EdgeHD 1400 with the Celestron 0.7x focal reducer (fl=2737mm, f/7.7).
Camera: Canon EOS 6D unbinned, IR modified. Best 11 of 13 - 10 minute exposures at ISO 0800. Temp approx. 69F.
Image scale: 0.49 arc-sec/pixel (resampled to 0.99 arc-sec/pixel). Image capture using ImagesPlus 5.75 Camera Control.
Mount: Software Bisque Paramount MX with PEC and ProTrack enabled. Autoguided with an SBIG Sti autoguider, a Celestron OAG (off-axis guider) and a Starlight Xpress AOLF (Adaptive Optics Large Format) device using PHD2 autoguiding software, not dithered.

20150513_M101_no-darks-CombExcAvg-IPddp-NEBcrv-IPadj-TPadj-IPad-TPadj.jpg