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Hi Tony,
That's a strange look you have there, I recently had been trying to do some imaging and by the way I have a similar setup to you and while trying to focus my guide scope and camera was getting a similar sort of halo around the stars in the PHD window, not as defined a circle as you have there but it turned out it was just the humidity level was so high, I mean 100% humidity according to the weather website for our location.
So my stars looked to be very soft on focus but no ring like that.
Maybe someone else has seen something that more resembles it.
Good luck sorting it out
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