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I do not use HFR change as a focus trigger as I have found it to often be a poor trigger as such. One night in particular I did see the HFR going up over about 10 minutes (Taking 2 minute RGB subs) and manually injected a focus run. The result was more or less exactly the same (Enlarged) HFR as before the run, about 20 minutes later the HFR settled down again so I put it down to a period of poor seeing and discarded those subs.
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