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I have an Edge HD8 and have used two guide scopes: the first was a 60mm ZWO guidescope, but have just switched to a Celestron 80mm guidescope which is on sale at Bintel, complete with rings and clamps. The focal length of the Celestron is a better match with the Edge. I have also tried OAG and had a horrible time with it, settled on the Celestron 80.
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