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Great field. Don't stress too much about CCDIS measurements. They will vary greatly depending on what you image. A bright cluster like this will show a depression in the middle of the field when it's not really there. In my experience alway stick to a bright central star and a uniform background . Rigel cent is a good candidate. Not too bright and lot of background stars uniformely distributed. And it's nice and up right now, easy to align too. Shoot 120s subs then measure, tweak, re-shoot the same field another night and see the differences from one session to the other.
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