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Alistair,
There's no reason that PHD would show any problems "guiding" on a poor polar alignment...it just does it's job...lock onto a star and keep it locked by issuing the appropriate signal..
The real issue is that all the other stars in the imaging scope are moving at dufferent rates, depending on the amount of PA error.
So, you can still have "good guiding" but poor imaging results.
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