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It really depends on your FOV but I would imagine that if someone was to go down the path of AO they're likely to be working at a longer FL anyway. Fundimentally, multi star guiding is there to average out stellar motion across a field so as to eliminate seeing induced motion so that you're not chasing seeing. AO by definition is to actually chase seeing in and effort to counteract it which is why it needs to run many times per second.
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