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Ok re-read and rotating your primary does not have the effect follow it.
mirror alignments aside, how are the primary coatings? good or soft? are you getting light back up the kazoo or bounce back? flocking of all light active components?- reflections off spider vanes mirror mounts etc. I know this is elementary stuff for an experienced guy like yourself but there are still varibles or combinations of.
GSO are known for variations in mirror figures, seondary too. I've had three now over ten years and all seem to be a little different in general-principle optical quality.
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