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The 8 and 12" Dobs are not comparable in this regard. It is easier to reach focus in an 8" Dob than in a 12". A WO style unit with a 1.9x corrector will focus in the 8" no probs (so maybe even with the 1.6x corrector supplied by WO), but it's a long way off in the 12" (and the 10").
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