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you need to be able to make slight adjustments when drift aligning so a moveable wedge is very necessary, when imaging at very long focal lengths you will find constant tweaking of the wedge is needed to get it exact.
l've had mine wedge mounted for some time now and am still testing drift every now and then and minor adjustments still being made to get it perfect, this really is the most critical point of astrophotography even if autoguiding.
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