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Interestingly, there seems to be two camps re back focus using a Celestron f/6.3 reducer. Mostly it seems to be 105mm, however there is mention of 85mm as well. For example, Bintel states that the back focus is 85mm for this reducer.
I'm using 85mm with the Celestron f/6.3 reducer on a C9.25 after much research and it seems to be perfect. I'm guessing that the scope is forgiving, but the results seem good. Mind you, I'm in the EAA camp using a Sony A6000 so your mileage may vary.
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