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Yes - I use both the standard focuser knob and Crayford focuser. I use the standard focuser knob to get the coarse focus and then the the Crayford for final adjustments.
As Rob indicates it does add extra length to the optical system but I have no problem reaching focus, even using a Meade 6.3 focal reducer and a DSLR with my C8.
The set-up that I use is:
Telescope -> Focal Reducer ->Crayford Focuser -> 2" Camera Adaptor -> T-ring -> DSLR
I have read elsewhere (but I can not recall at the moment) that there is a preferred distance from the Focal Reducer to the Camera. I believe that the distance from focal reducer to Camera is longer than this preferred distance using the Bintel Crayford focuser.
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