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I have recently aquired both a TMB 6mm and an XF 12 mm (in the same transaction) so if weather permits this Saturday night I'll try to do a comparison in my 12" f5 dob. I don't have an Orion barlow, but I do have both a Meade #140 and a Televue 2x (not Powermate) to try.
I'll see what I can do.....
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