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Marc - thanks.
The problem I have with orientation in this case is that the combination of Camera, reducer and spacer means that I cant swing the arrangement through the fork to do a one star align after the drift align. So in this case the sky flats were taken before drift alignment, the camera removed and then replaced (carefully I had thought) after the one star. So that would likely account for part of it
Greg
Thanks for the very detailed response. So in addition to above, I take 10 flats for each of LRGB, no T shirt and do this at dusk. I've tried calibration a couple of ways now on this set of images
1. Though CCDSTACk - making flat masters with simple mean, calibrating etc
2. Though Maxim DL - using the stack processing option
--> Both give me the same result so far
I also see what you mean on the hot spot. There is definitely one present without much latitude for error - 50 K and its there, 45K and its gone.
I've been trying some daytime flats inside this afternoon on a white surface with differing ADU counts. So i will see how I go there
I would also like to hear more from the group on flats. Its my new bugbear!!
Dan
Ths point on focus is a good one and not something I had thought of.
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