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Ummmm....couple of thoughts...isn't Rigel Kent a triple star and might this not prevent a mask giving a clean pattern?
Second thought : autofocus can give you a full frame optimised focus (depends on your software of course) that will be immune to field curvature issues but if you focus on a single star then you have achieved spot focus only stars in that exact position will be in perfect focus, balanced focus will be slightly inside that position I believe...
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