Its all the ZWO cameras. If you don't use backlash compensation you probably wouldn't notice it. PHD2 runs ZWO cameras in video (streaming) mode. With backlash compensation the correction can be long enough to still be going when the next video frame is taken which creates a trail on the guide star. Not sure if the fix pauses the stream or switches everything to snapshot mode. I know with some cameras, snapshot mode causes a delay so I might give this one a test tonight.
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