Hi Const....no need to interrupt your observing at all! Just observe as you normally would, preferably over multiple nights even. Use autofocus whenever desired (as you normally would). The only thing you need to do is enable focus log debug. The output of those autofocus runs will be stored in the autofocus debug log (see the original post again for the details where these are stored). Build up a dataset over however much time you want. Whenever convenient, go back and snag those logs and plot them. The only caveat is that you shouldn't mess with your focuser (like take it off the scope). If you do, make sure you index so you can get back to a consistent location. Simple! Cheers, Doug

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