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Originally Posted by janoskiss
I'm also getting the hang of star testing and slowly learning what to look for. I noticed that the diffraction ring patterns look quite different inside and outside focus. Although it did not really look like any idealised star test pictures I've seen, the closest thing to what I've seen at the EP corresponds to spherical aberration. So next mod will be a 7" mask over the 8" mirror.
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A mask is for masking off a turned edge, it wont do anything about spherical aberration.