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It doesn't have to be perfect, as long as thry are pointed in the same direction. After all sky rotation is a constant for both scopex. If your guiding on a star and that guides the mount, you will be right. It used to be that people would "pick" a guide star off their imaging scope light path with a prism inserted into the light path. This assumes flex in external guide scope mounting etc. The majority of imagers don't worry go much about it these days.
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