OK so i could not resist this but here is a 1 hour 50 min collection of 5 min sub frames stacked of M33. I also have a 2 hour set of data from the sBIG on the object from the evening before yet to process — interesting comparison coming up. The image below is from the Sigma 150-600mm lens using the 6D also

 

M33 FLT110 and 6D with Orion 0.8x reducer

M33 FLT110 and 6D with Orion 0.8x reducer

M33 350mm Sigma Lens 6D with HDR Filter applied

M33 350mm Sigma Lens 6D with HDR Filter applied