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I don't know what the copy-to-copy variability of the AZ-EQ6-GT is, but if it's anything like the EQ6PRO or NEQ6 then you won't be able to get a single meaningful number.
I have two EQ6s (both hypertuned by previous owners) and the tracking performance difference between them is *huge*. On the good one, I can get round stars at 1625 mm and 1.36''/px image scale most of the time using up to 1.5 sec exposures with standard autoguiding. On the other one, I need at least 4 Hz adaptive optics corrections to get round stars with the same OTA + image train.
From what I've read online, other people have reported similarly large discrepancies between "good" and "bad" EQ6s.
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