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Hi John My best guess is your dither at 23:29 resulted in PHD guiding on a hot pixel, so it would definitely mimic something like your scope "not moving"  in subsequent guiding, it no longer was on a hot pixel Couple things to mention in your PHD settings to avoid this (and also some thoughts on your settings in general): set your minimum HFD to at least 2 pixels  not sure why you are bin 2? you can bin 1 and still have a good image scale for guiding i also suggest increasing your exposure to the 2-3 second range. at 1 second you are chasing seeing. Your graphs look pretty choppy so I suspect that's the case here.
On Thu, Nov 11, 2021 at 11:55 PM Endymion <john.creigh@...> wrote: Thanks Brian! Attached are the logs. The event occurred around 23:27. --
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