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IVO,
Sorry,
what I'm trying to say is that even if you add the contribution of the light from the 1st and 2nd rings ( total star energy = 94%) the apparent saturated star image still seems to exceed the linear diameter of the rings....
The background shot noise level will be sqrt max intensity, which I'm sure would exceed the residual star energy...so no additional signal to expand the image???
I probably need to use the photometry aperture feature (AA5) to better determine how the summed ADU count in each star image changes. This should be linear (for non- saturated images) - but what about a saturated image?
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