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One tip that may help. The CDK17 when I first got it had some offaxis bright star light streaks. As time went on Planewave issued various baffles.
The secondary shroud originally was a tube. Then it became slightly cone shaped so when it screwed back onto the mirror it baffled about 5mm of the mirror further suppressing reflections. So it goes from 5mm or so thick at the mirror down to 1mm at the edge.
Greg.
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