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Thanks Richard, yes, I did a bit of tweaking with just the core of the Keyhole myself last night, in StarTools, and came up with something similar, see attached. It is the larger vista that presents the colour issues.
The darks are matched well, and I calibrated with flats and bias. The problem, I think, is the subs quality due to the mount (and short exposure). Soon I'll be up and running with my AZ-EQ6 and the game will be afoot!
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