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Thanks Raymo, will try next clear night. All our imaging is done prime focus, so camera is connected directly to the scopes. I have been looking through old subs, and this was not present 3 months ago. The lights from the note printing works are to the east, about 300m away and now very bright. The attached image was taken in the north east about 35' above horizon. The interesting thing is that the introduction of CA also corresponds to an increase in noise in our images.
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