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I always worked it out like this :-
QHY9 with nose piece distance to silicon including glass = 30mm.
M42 male wheel adapter = 2mm.
Wheel = 19mm.
M54 Male to M42 female from qhy = 4mm.
Total = 55m.
You should also add 1/3 the thickness of the filters to the path.
I've used this setup with an mpcc and it worked fine.
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