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Also note your focus. A 12" SCT operating at F/3.3 has a extremely short critical focus zone of 23.9 microns. So you need to get within this zone for the field to look sharp. We are talking a distance of 0.0239 mm here! This is not impossible but may take some time to get right. Obviously, the further out of this zone, the larger your stars will look.
When you put this in perspective, your first results are a pretty fine effort.
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