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Hi Andrew
Strange indeed - I experience the exact opposite!
WO 80mm + WO 2” diagonal + WO x2 Barlow + eyepiece = focus.
WO 80mm + WO x2 Barlow + WO 2” diagonal + eyepiece = no focus.
However, in my SCT and Vixen refractor, I have noticed that if the Barlow is placed BEFORE the diagonal, you do get an increase in barlow amplification.
Cheers
Dennis
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