Quote:
Originally Posted by Octane
Peter, what are those doughnuts around Fomalhaut? There's three overlaid on top of each other, each getting bigger?
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I suspect off axis reflections from the field corrector..or possibly the CCD window/filters.
In time I'll try out all configurations (eg mirrors only, reducer/corrector) to see whether there is a difference.
I'm not fussed as I've seen similar in my other 'scopes...plus I don't normally take images of 1st Magnitude stars.