To see the complete Leo Triplet, see: http://www.pbase.com/wjshaheen/image/41973708/large
Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300. Exposures: 7 @ 16 min., Ambient temp 56-60f.
Image capture scale: 0.41 arc-sec/pixel (un-binned). Field of view (horizontal) = 26.2 arc-min. Image capture using TSXPro Camera Add On (Software Bisque).
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: NEF conversion and calibration, alignment, stacking/combining using 0 dark frames, a 5 bias frame master and 0 flat frames, Min/Max Exluded Average combined. HDR Stretch, Curves and multiple enhancements in ImagesPlus. Cropped to 3840x2160 (4k), then downsized 50% and slight contrast boost in ThumbsPlus. Final image scale/resolution 0.82 as/p).
For camera conversion services, i.e., having your DSLR "IR Modded" (IR filter removed), visit Life Pixel Camera Conversion Services here