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I swapped my C11 for a standard Meade 12" SCT recently and this Meade shows the same ring around bright stars visually. The C11 didn't show it and a Meade 10" ACF that I have doesn't show it.
One difference between the 3 scopes is that the 12" has glossy black paint in the baffle tube which is highly reflective while the other two have flat grey paint in the baffle.
The issue isn't important to me but I thought the report might be interesting to others. I suspect some flat black/grey paint wiped into the baffle from both ends might cure the problem, or perhaps a roll of flocking paper placed in the baffle.
I'd be curious to know if Joshua's old scope has flat or glossy paint in the baffle.
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