Thanks Marc and Michael. For some reason I had thought Ha data would be a bit cleaner than broadband but from what you’re saying I may well need to try a new approach. It’d be a really good idea using the mono guide camera, except for the slight hitch that the fov would necessitate a mosaic! I really can’t squeeze much sky into the fov at 2700mm lol! I do truely think I can get better data which will give a better result, but the way things are going, maybe not this season…
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