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Hi Paul,
don't take my comments as critisism, please. It ios a great shot.
Do you really need the field derotator, with such short exposures, keep them short, shoot more, and stack them.
I can normally find a very bright star, focus on that by eye, and then switch to the target, and keep focus. (with a 1250mm newt anyway, and your focal reduced SCT should be similar??).
Try a trial with the reducer, and no derotator.
Gary
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