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Martin, could it simply be the camera? Have you tried another camera? Given all that you have tried, there is no mention of the camera. I would look there, through every optical surface, right down to the sensor chamber.
Your focus star brightness may be over coming the diffraction. Is it a cooled camera, with the temperature set below 0C, humidity in the chamber could produce ice crystals. Have you serviced the dessicant? Etc. An examination of the camera at room temperature would tell you nothing.
The scary thing is that you may not find anything, until you duplicate the exact conditions again.
My money is on the camera.
Last edited by glend; 03-05-2022 at 11:34 PM.
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