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Hi Geoff,
I guide with ED80(f/7.5) and take pictures with 8" SCT(f/10) reduced to f/6.3. My mount is EQ6 Pro, guiding camera is qhy5 camera and I am using PHD with "on camera" option.
Guiding seems to be quite accurate for me even though the focal length of my guiding scope is twice less than the focal length of my imaging scope.
I was also trying pulse guiding twice with the same setup and EQMOD connection to the mount but I was unsuccessful. It did not seem to guide as good as when it's using a ST-4 port on QHY5 I'm sure pulse guiding can be used on EQ6 pro via EQMOD and ASCOM as there are a lot of guys on EQMOD yahoo group who say that it works fine. However I just guessed then that there was something wrong with my settings related to guiding in PHD/EQMOD and decided put it aside for a while and don't wast my time.
The next time I'm going to switch my scopes and use APO as an imaging scope and SCT for guiding. I've got a little more faster APO with f ratio 6.8 and want to see how it goes.
cheers,
Michael
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