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If you have a DSLR or middle weight astrocamera hanging off the back of the ED80, then you'd be better off mounting the guidescope on the dec axis. If you put too much weight towards the back of the scope, you'll have problems balancing the tube and will have to add counterweights to the front of the tube to get it to balance. I can only just get my ED80 to balance using a DSLR. Have to push the tube rings as far back as possible.
Better to use the clamshell type rings described below and mount the guider to a bar between the tube rings and centrally over the dec axis or even forward. You could also mount a dovetail bar as suggested.
Joe
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