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I have a 10" dob.
so at 12.5mm or 100x this is a fairly close representation
and also at 6.5mm or 192x
the rings are aprox field of views
your 9mm without any barlow should be roughly between the two size scales.
put the barlow to the side for a moment and just have a go with the eyepieces. if the atmosphere is shocking then don't worry about detail, just the size of the disc
hope this helps
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