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Well theoretically you can get it down around zero if you're spot on Stephen. How are you measuring your drift? Even assuming you are pointing perfectly at the South C pole, you'll need to have perfect balance, no flexure, great seeing, etc.
If you're guiding for astrophotography, then its more the rate of change that matters. Assuming you're talking arcsec/sec, as a guide my HEQ5Pro moves through about +/17 arcsecs over a 8min worm cycle even if its aligned "perfectly" (i.e. that's a rough indication of its PE). Some would say there's actually a benefit in being slightly off to one side so that your guiding is constantly tweaking your DEC axis in one direction, thus avoiding backlash when your mount tries to reverse DEC tracking.
Last edited by RobF; 23-01-2011 at 03:22 PM.
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