The star rounder plugin uses the darken blend mode of layers to block out the unwanted elongation sections. It will reduce resolution of nebulas as well as it stretches and shifts the image.
Best to use a lasso tool and limit what area the star rounder plugin affects so it doesn't affect the neb areas. Then use the smudge tool to push from the outside to round out any elongated stars in the neb area.
Greg.
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