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Sharpening is best achieved at the point of acquisition with good seeing, good focusing, adjustments for temperature for the focus.
Then in processing by removing subexposures with FWHM that is too large or star bloats from a passing thin cloud etc.
Sharpening also works best on images with strong signal to noise ratio so long enough exposure comes into it.
I find deconvolution is handy sometimes when the red or blue subs are bloated compared to the other colours and can get rid of unwanted blue or red rings around stars.
Multi scale decon can work if only in the bright areas of an image. Worms appear first in the weak signal areas of an image. So selective sharpening works best. High Pass filtering is fairly non destructive when masked in only on the detail areas.
Other than that I haven't found too much that works well for sharpening. It easily goes south and poor sharpening is the mark of an amateur.
Greg.
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