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Peter,
I believe in KISS...
The ONAG distances are:
backfocus for imaging=66mm
backfocus for guiding =90mm
A difference of 28mm.....
If the guider were in focus then the imaging camera CCD would be spaced 28mm behind the ONAG to also come to focus. Agreed?
If you can fit your filter wheel in this gap then it could work...
However if you need a fixed distance from the FF then the spacing from the front of the ONAG to the camera (=90mm) would be too much.
Placing the FF behind the ONAG would mean moving the final imaging focus to 66+55 = 121, and fitting spacers to the guide port to compensate..
I think if you sketch the components out using the dimensions you have will give a clearer picture.
Ken
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