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Bert,
""The reason bright stars are bigger than dim ones is that the very weak higher orders of the Bessel Function are saturating the sensor."
Not strictly true....
All star images will have the same FWHM...
What is happening is that the brighter star image becomes saturated and the dimmer images only record the brighter core "peak".
The PSF of the telescope can effectively destroy the neat Airy disk pattern.....
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