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Well how long is your focal length? If its an SCT and your using a barlow, your probably dealing with at least 4000 mm of focal length. The longer your combined focal length the greater any error is going to appear, in terms of drift in the frame. That is doable for planetary imaging assuming your using high frame rate video and stacking frames. Try keeping your video frame grab to 30 seconds, you should get alot of frames to stack in that period and virtually no drift. Your software will align the frames.
What equipment are you using? What software are you using?
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