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Soft edges. Hard edges look shocking. If I overdo deconvolution then sometimes I select the stars and run a small blur to soften them up. But generally its a processing error to make stars have hard edges. Usually its caused by oversharpening, overuse of deconvolution. Decon works better on oversampled data than undersampled data.
Its all part of the airy disc theory. In telescopes that are well made you should get the bulk of the energy in the first airy disc and a little in the secondary ring.
I guess the fact its called an airy disc implies a soft edge.
Greg.
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