Distance 36 +/- 5.0 Mly in Leo.

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300. Exposures: 4 @ 8 min., Ambient temp 50f.
Image capture scale: 0.41 arc-sec/pixel (un-binned). Field of view (horizontal) = 38.9 arc-min. Image capture using ImagesPlus 6.0 Camera Control.
Mount: Orion HDX110 German equatorial mount. Autoguided with an SBIG Sti autoguider, a Celestron OAG (off-axis guider) and a Starlight Xpress SXV-AOLF (Adaptive Optics Large Format) device using PHD2 autoguiding software, not dithered.
Post processing: ImagesPlus 6.5: FITS conversion and calibration, alignment, stacking/combining using 0 dark frames, 0 bias frames and 0 flat frames, Min/Max Exluded Average combined. Stretched, DDP and Curves in Nebulosity4. Noise reduction in ImagesPlus (1 pass). Downsized and cropped to 1920x1080.

20160330_M66-M65_CombExcAvg-NEBddpadj-IParlnr-1920x1080.jpg