Thanks for the info Joshua. I guess the next question is 'are there any 12" Meades that don't show the ring'? Maybe it's inherent to this particular model. Looking into the front of the scope it's clear that more off-axis light gets past the secondary to the rear of the baffle than in the 10".
It's all an exercise of curiosity for me - the scope shows very nice images generally and has given me my best view so far of eta's Homunculus.
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