is PHD correcting both axis at the same time? so it can correct Dec aswell as RA at the same time, might be that PHD corrects for one but misses a command to correct for the other so it catches up by then the star has moved too much in RA or Dec? Only a guess mind you, I know of some software that only being issued with one command at a time. I havent actually used Autoguiding on a mount yet, always used Pulse guiding.
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