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Old 08-08-2022, 12:17 PM
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JohnH
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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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Old 09-08-2022, 02:14 PM
Craig_
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Quote:
Originally Posted by JohnH View Post
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...
Re: Rigil Kent - not sure, I will try another star next time! Thanks

Re: the AF routine, it isn't coming back optimised for any area of the frame, it's just way off (I'm talking 100+ steps out.)
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