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i believe it is a combo of bad seeing and underexposure.
ok, i am thinking too.
double slit experiment, diffraction rings.
if we have a circular object morphing into ellipses etc with bad seeing, then as registax is in the process of beta testing multipoint alignment, then with the current version the edges of these bad circles will combine during stacking to form these onion rings like a diffraction pattern.
i have notice i still get diffraction rings when star testing even though the seeing is bad. not airy patterns, just diffraction patterns???
anyone following or am i grasping at straws
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