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Graham I am going through this myself. What I did was worked on the premise that whatever the metal back distance is from the FF can take up camera filter wheel and AO if there is room. In my case I have 106mm to work with. 61.84mm for the camera and filter wheel, 30mm for the AO and then a small adapter to the FF.
Just remember though all that takes up usable back focus and that needs to be subtracted from the whole back focus of the scope.
So with your camera is the back focus including filter wheel and guide camera prism 17mm? Or is it more with filter wheel and guide pick off prism?
How much room does the focusor take up?
What is the overall back focus of the scope?
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