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Paul.
On my set up an AP 0.67f reducer on the SBIG nose piece actually goes inside the TCF-S (does your televue?) and takes up no back focus at all outside the TCF-S. Why do you need an 80mm extension tube?. With an SBIG, filterwheel, nosepiece, reducer, TCF-S, on an LX200R, I have more than enough back focus left - even for an A07 !, how come yours is so short? (will it be, on a C9.25?)
You will probably end up uesing Focus max for autofocus, its the best by far, make sure if buy focuser that it is compatible with focusmax (TCF-S is).
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