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Hey Robin,
Im currently prototyping a OAG that directly attaches to the QHY9 FW and Camera to virtually turn it into a QSI type of set up. hence you don't need a massive aperture. It will also be set perfectly for 55mm back focus.
At the end of the day I would look for the strongest body the rotatable ones unless they have a good locking system in my mind are pretty bad as they introduce more flexing points within the system
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