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I mainly shoot with 1600 but thats only because I couldn't get enough exposure time so I needed all the help I could get, now that I have autoguiding I'm most likely going to use 800 at first till I get a bit more experienced then maybe drop down again.
I've shot some objects with 1600 and used 32 exposures and they where still noisy, I'm sure that the same number of exposures with 800 and a longer time would yield better results but I haven't tried it yet.
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