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Like Rick said accurate flats will remote any artefacts. Having a library of flats will not work for imaging at longer focal lengths too. You will need to do flats for every session. The short focal lengths this is not so bad if you don't take the camera off the lens or telescope. Once you do that you will introduce dust into the system and create errant motes. So there is no point in creating a library of different telescopes when it comes to flats.
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