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Hi Terry,
I'm using a Orion short tube 80 F5 400mm from Bintel with my Qguider and PHD to autoguide. This works well with both my HEQ5PRO with Skywatcher 80ED F7.5 600mm and my Nexstar 11 GPS SCT at F6.3 1764mm. I use 2.5 sec adjustments with PHD. The short tube 80 makes it very easy to find guide stars. You can normally choose from 5 or 6 in the field of view.
Regards,
Stephen
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