Quote:
Originally Posted by codemonkey
Not sure yet, just established that turning the fan off improves FWHM significantly and fixes my on-axis elongation. Solution right now is: I turned the fan off.
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I reckon it was due to the primary temperature not being uniform. You might have had a hot or cold spot under the fans maybe. I had similar issues by applying gentle heat to a newt primary. Unless it's evenly spreadout you get those temperature differentials that causes stress in the glass and it translates to wonky star shapes.