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Agreed Brendan.
Even a light breeze can set things a flapping. The importance of having all cables and straps secured can't be emphasised enough.
A good guide star helps tremendously. But when the seeing is bad, if you slightly defocus the guide star, it helps to prevent the guide program from "chasing the seeing".
Sometimes though, a recallibration is the only way to set things straight if the first sub gives you eggy stars.
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