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Well, don't have a great deal of experience yet, but I'm trying my old Tasco 50 x 600 refractor (35 yrs old!) as a guidescope on my ed80. Seems to work OK, but the ed80 focal length is the same as the Tasco. In your case the focal lengths of the guide scope and imaging scope may have to be more evenly matched by using barlow/focal reducer. I am using a Toucam as the guide camera, and have found that the focuser needs to be wound nearly fully in to focus. This has the added benefit of reducing the focuser play a lot. I bought a Toucam 0.965" adapter for the guidescope from Stephen Mogg, and made a pair of guide rings from ply to mount the guidescope on the ed80.
In short, I believe that the 60 x 700 is certainly worth having a go with.
Regards,
David.
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