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With PHD 2 you can store the coordinates of the guiding position (found with the slit illuminated) and it will pull the star to that location automatically.
With objects that are too faint to see in a 1-2 sec guider image (I am currently down at mag 17.5 with a modified ALPY) you can work out the offset of the target from a field star from a longer exposure image, dial in the needed guide position and land the target on the slit without even seeing it - brilliant!
Robin
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