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Allan,
I've successfully guided my C11 @ F/6.3 with an ST80 (400mm). At F10 I've never tried, however I've seen a few guys in the states using 200mm focal length camera lenses, and also 9x50 finderscopes to guide 12" LX200's...
I dont think its overly critical, just as long as your guiding is accurate. (given the TV Guider, I reckon you'll be right as rain with a 560mm guide scope)
Bojan makes a valid point though. for guiding to have sub-pixel accuracy in the final image, the guidescope and camera should have same or better resolution.
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