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I have seen something similar with my Dob using the N31t5 on Jupiter, I put it down to the very shiny filter threads on the TV eyepiece and the fact that the Nagler 31 required the focuser racked in much more than others. I tried to replicate the 'aberration' with my Pentaxes and could not. The XW threads are flat black......
Not saying this is the cause..... Just typing out loud .....
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