M51

The total exposure is about 3hr. and 34 min (1min. subs). I have about 60 darks, 30 flats, and 30 bias.

ISO = 800
Mount = HEQ5 Pro (Aka Sirius)
Main Telescope = Mak 150 FL=1800
Main Imaging Camera = Canon 40DH
Autoguiding = ST80 + SSAG + PHD