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I wouldn't say "perfect" because that's a bit of a stretch ... but .. a couple of times now I've been lucky to have good enough alignment that I don't need any other polar alignment done and be able to take 10 min exposures OK at 500mm focal length.
It is very rare but your chances are significantly increased by having a process you follow to get that initial setup right, knowing deviation from magnetic south & using a compass, leveling the mount well, setting latitude best you can.
Roger.
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