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Actually, I have just remembered an important point that will definitely be playing a part here. At some point during setting up the equipment in the observatory I must have inadvertently changed the gain and offset on the QHY12 and all the raw images were horribly clipped.
So I measured the bias frames properly and did some experimenting to set a value for the gain that produces what I thought were pleasing results. I suspect though that the settings I am now using are much more appropriate than whatever I had set at Astrofest. It is possible that for a couple years, since owning the camera it has been under performing until now.
It will be interesting to do this comparison again when I do have some data once more from a dark location - which will probably be Astrofest.
Chris
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