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I've always used fixed rings with my guidescope for their compact size and minimum flexure.
My guidescope is piggybacked off the main scope via a 13mm thick alloy bar. I have filed a slot for one guidescope ring to allow adjustment in azimuth, which was useful when I used a webcam for guiding.
Now I use a QHY5 for guiding and I've always been able to find a guide star on-axis using 2-second exposure and a darkframe. My guidescope is an ED80 (80mm f7.5)
Cheers,
Rob
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