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Hi Matthew
I reckon Jase might have hit the nail on the head...
He mentioned Airy Disc and I'm just beginning to realise that the Airy disc may only refer to those very close/fine diffraction rings when the star is sharply focused, whereas diffraction rings occur when you grossly de-focus the star. So, being close to focus, the Airy disc is a more accurate indicator than the grossly sized diffraction rings?
Just guessing, but I'm off to do some investigation on Airy verses diffraction rings.
Cheers
Dennis
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