Quote:
Originally Posted by Stefan Buda
Craig,
Have you tried rotating the Bahtinov mask 90 degrees after achieving focus to see if in the new orientation there is no focusing error visible?
Bahtinov masks are sensitive to residual astigmatism, if there is any in your optics, so a particular orientation of the mask may not achieve the best focus possible.
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I have made small rotations, with no visible difference, although this was moreso to try and centre the mask in case that was the issue. My optics are pretty good on the Esprit 80, so not sure that will be the issue but happy to try it next clear night as I'll try anything
Cheers