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Hi,
Someone please correct me if i am wrong but with guiding while aperture is good its not that necesary as with a smaller guide scope you can just increase the shot time on the guider to find more stars.
What is important is matching the FL of the imaging scope with the FL of the guidescope. For example if you tried to guide a Celestron C11 at 2700 ml with an ED80 at 600 ml you would get very poor photos because the guide scope would not see the movement being seen by the C11. In this case you would need to Barlow the ED80 significantly to at least get closer to the C11 FL and increase the shot time on the ED80.
Paul
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