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Astronomy and Cosmology
Astronomy and Astrophysics
Diffraction Effects and Artifacts in Telescopes like the JWST
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[QUOTE="collinsmark, post: 6814536, member: 114325"] This is not true for linear data. As a matter of fact, that's the very reason why full width half maximum (FWHM) is such a useful parameter: So long as the star is exposed below the point of saturation, and so long as the star is exposed enough such that the noise floor is negligible -- in other words, so long as the star's exposure is within the linear region -- the star's FWHM is independent of the star's brightness (brightness due to its inherent magnitude or due to exposure characteristics). The star's FWHM doesn't change with brightness so long as the star's image is still linear. That's why FWHM is such a good measure to be used by autofocus algorithms for telescope autofocusers. Yes, in principle that [I]is[/I] what I am saying -- that is ideally, when the data is linear and we can ignore saturation and noise floors. Diffraction artifacts are in that sense without bound. [/QUOTE]
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Diffraction Effects and Artifacts in Telescopes like the JWST
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