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In addition to what Mike said there, with field rotation using alt-az mounts, you can get field derotators for some SCT brands that pretty much negate that problem. Especially for short subs on objects like planets and bright DSO's. Most of the latest image processing software for astropiccies will take care of some field rotation as well. Ultimately, you would want to have accurate polar alignment if you were going to take piccies of faint fuzzies. It's much better if you do. But the field derotators do a good job.
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