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That is very interesting observation Greg that goes against ones intuition. I do not have any experience in guiding at long focal lengths (longer than 1.2m), but I can certainly second what you wrote about binning - it does not fully hide guiding errors. When guiding was bad with my previous mounts, even binning 3x3 resulted in eggy stars in some subs, in spite of my hopes that stars will be perfectly round in all subs.
It seems that accidentally I started a quite interesting and useful discussion :-)
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