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yes, guiding FL matters less these days, more of a problem is the weight and flex of a large guide scope. I guided a 3m FL SCT with an ST80 on a G11 and it was fine. It wasnt with an ED80 just because of its weight and flexure. Guiding with the big OTA is fine, just bin the guide cam at 3. Cleaner exposures too, bonus.
As Marc says, you could use anything to guide an ED80, even a finder.
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