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If you are guiding on a star, but looking or imaging a planet, you will get drift. This is due to the fact that the planet is moving and the stars are not.. Not totally true but best for this explanation. You are able to track relative to earths rotation but tracking another planet changes this. In some scopes you can change the tracking to allow for planet work and you then need good polar alignment... I don't use guiding with my guide scope for planet work...
Regards
Mardy
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