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A few things to consider....
back focus available to fit your imaging train into, distance needed by coma corrector, back focus of the CCD itself....
I use a Baader MPCC and an Atik 428EX CCD, an Orion filter wheel and TSOAG9 fit into the coma correctors spacing (just). This is on an 8" f/4 GSO newt, and moonlite focuser...
I would not be able to fit an AO in there anywhere.
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