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You need a 50mm spacer between the CCD sensor surface and the face of the last lens of the MPCC (Closest to the CCD sensor).
The problem is by adding all this, you can throw out the focus point, unless you use it in a way where ALL the MPCC and the spacer is inside the focuser. Then the camera will be in the same position as when the MPCC is not connected.
Example, i use my MPCC with the T thread spacer,. The whole MPCC and spacer slide deep into the focuser (Remove the threaded ring on the MPCC), and the MPCC sits in the focuser as if there was nothing else attached. This will only throw your back focus by about 10mm as if you were imaging without it.
So if you are having problems, check your spacings !.
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