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Just rotate the primary 45 degrees, re-collimate and see if the orientation of the startest astigmatism has changed accordingly. If it remains the same then you need to investigate the secondary. And you should do the testing without a CC in the optical train.
If the orientation of astigmatism changes 45 degrees then there is not much you can do with that mirror. If you received o test certificate showing a very good figure, it means that they turned off the astigmatic component in software - that is cheating.
Last edited by Stefan Buda; 03-08-2025 at 09:17 AM.
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