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The ST80 is much lighter (and cheaper), optical quality doesnt matter squat for guiding. Your guiding will be much better with a lighter guide scope, less load on the mount. I had an ED80 on a Lx200 12" OTA/G11 for guiding, woefull (not the ED80s fault ;-), then I went the ST80, and alls well, The wider field gives much more choice of guide stars too. Use good autoguiding software tho.
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