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People get this strange idea that because perfect Airy-discs are used to model an ideal PSF for a star means that nebula images will somehow get screwed up by deconvolution. They won't - provided there are at least a couple of stars in there to train the blind deconvolution algorithms. The correction model that effectively "sharpens up" the stars will also be applied to the nebula, bringing it back closer to what it would be without distorted air and optics in the way.
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