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Not 100% sure what you are asking here, but my advise is stay with 2" for your DSLR, and use a dedicated lunar/planetary/guide-cam in 1.25". This also means either a 2.5x or a 5x Powermate.
I can't think of why you would want to barlow the DSLR, but you will want to with the lunar and or planetary imaging.
Gary
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