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No matter how good your pec is Doug, for long shots (120sec + ) I believe you will still need to guide. The pec will take care of your worms periodic error, but you will also have some non-periodic errors as well. And no matter how well you drift align to get your polar alignment as close as you can, there will always be some small amount of movement in your mount that will cause drift errors. It is just isn't possible to build these errors out of a mount or scope.
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