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I guess it just depends how long you want your exposures to be. Ideally, the more accurate the better. 1 minute exposures might be ok for an integrating video camera??
For a DSLR or astro CCD, 5-10+ minute exposures are common, so any drift is unacceptable and drift aligning is critical. Not to mention guiding. Guiding will hide polar alignment inaccuracies in single exposures (sometimes) but you'll get field rotation over the course of your session.
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