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It seems most people guide... so tracking error is irrelevant.
However, the imperfect polar alignment contribution should be possible to take into account, it will manifest itself as a drift in one direction - easily identifiable and measurable.....
Edit:
And yes, I can expose up to 30sec with standard EQ6 (no PEC), lens 1000mm, Canon 400D, without visible trailing. That means, error is less than 5" (judging by the size of star images (not overexposed)
Last edited by bojan; 17-10-2008 at 04:25 PM.
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