As far as I am aware, the qhy9 has these specs
body to sensor 15mm
optic window 12mm
FW 18mm
With threads and the 5 mm adaptor for the filter wheel to mpcc I get 55 mm to the shoulder of the mpcc.
you have a say 10mm OAG in the system, so I would have thought that taking the 12mm optic window out would pretty much get you dead on the mpcc specs.
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