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It may be I haven't finetuned my settings properly but I have heard good effective guiding shouldn't exceed 10:1 focal length for really accurate guiding. My 50mm finder works well with my f/6.3 reducer but I see noticeably oblong stars when shooting prime at just over 2000mm.
Just read a thread about guiding through a guidescope so I'll have a play when the moon disappears and see if I can push my exposure up a bit.
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