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Patrick at the zenith any thin profile astro mirror larger than 6” will sag under its own weight if the forces supporting it are unequal or unequally distributed (the whole point of a multipoint mirror cell), causing the image to be deformed.
For a thin 20” solving this adequately is not a trivial matter and as Kunama suggested I’d be taking a very close look at the mirror supports.
Last edited by Wavytone; 17-11-2018 at 03:50 PM.
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