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Don't know what is your scope or camera, but 5s and 30s(!) sound like very long exposures for such a bright target as Betelgeuse. Are you sure you aren't saturated?
When I look at the FWHM measurement from Artemis Capture, I find I need to have a reasonably dark background and be well away from saturation for it to make sense. This means reasonably faint targets. Maybe the same applies to Maxim?
-Ivan
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