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You can use a "finder guider" with a long focal length (1800mm, but the Vixen at ~1250 would be easier). You need to change a setting in PHD (minimum movement, I think), so that PHD will see a smaller movement of the star as something requiring correction. It has been a while since I set it up for a friend, but I think we changed it from 0.15 to 0.05.
All the best,
DT
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