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at 3000mm focal length you will almost certainly need to use an autoguider to get longer exposures. The best I have ever done without guiding and no trails was about 3 minutes with my NEQ6 Pro but that was with a focal length of 1600mm and almost perfect polar alignment. I would concentrate on getting your polar alignment spot on and only use your scope at prime (not with a barlow) if you are not autoguiding, before you try and go deep. On the plus side your focus looks spot on
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