http://www.astrobin.com/full/297031/0/
1.8 hours shot with an unmodded Nikon D7200 at ISO 800. I have a more saturated version of this hanging on my wall.
http://www.astrobin.com/full/301155/0/
1.6 hours with an unmodded Nikon D810 at ISO800. If I had have actually framed it I could have easily and nicely fit both M20 and M8 in the field.
http://www.astrobin.com/290892/
Four minutes (crop of a four panel mosaic) shot at ISO1600 with my old D700.