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Hi Rodney.
Well, obviously something is wrong with either the design of this petzval APO or this particular example. How disappointing!
A wild guess, might your Astronomik blue filter be transmitting more UV than a competitor's filter? The UV might not be within the corrected range of this APO.
As a temporary cure, try running BlurXterminator on just the blue channel. You can set it only to correct star shapes and not deconvolve.
Good luck,
Peter
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