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What is the 2x Barlow...GSO or other?
From my extensive mucking around with Barlow's. I found adding a 35mm extension tube to a GSO 2" Barlow, makes it a 2.5x Barlow. Guessing at this with visual comparing with higher mag eyepieces, and 4 eyepieces will then get you a whole range of magnifications.
My suggestion...GSO Plossls 32 25 20 and 15 with the 'modified' Barlow.
A more expensive version is TV Plossls and a 2.5x Powermate.
32 25 20 15 add the Barlow @2.5x and put the 32 in again and work down from there to get...12.8 10 8 6...no duplication of mags.
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