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what filterwheel are you using ???
what model MPCC are you using ... is it a mark 3? because they have a removable tmount thread which goes to a m48 thread and increases backfocus from 55mm to 57.5mm.
I recently got a SX filterwheel with SX OAG and the mk3 MPCC and the distance is spot on for me Although field testing is yet to occur.
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