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I don't know about the QHY8L, but when I use my Moravian G2-8300 camera (also on the slow side to download images) it certainly doesn't take long at all to download images using PEMpro. I'm fairly certain that this is because PEMpro uses a subframe and it is fairly small and easy to download. If you have not tried your camera I certainly would! I would do this if only because PEMpro will have a much easier time finding a star (you don't get to select it, PEMpro does!). And, also the wide field will make it easier to do the required camera calibration before you start measuring PEC.
I agree that the exposures should be as short as possible and at a high resolution (barlow!), but you need a good steady night and some patience! Also, pretty good polar alignment will help too and keep the star more easily centered during the measurements.
Peter
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