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Astronomy and Cosmology
Astronomy and Astrophysics
Diffraction Effects and Artifacts in Telescopes like the JWST
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[QUOTE="sophiecentaur, post: 6815903, member: 199289"] [USER=114325]@collinsmark[/USER] I'm sorry but your post is far too long - unnecessarily so for anyone to bother to read thoroughly. With respect, is says little more than "I (i.e. you) was right all the time." You took exception to a comment that diffraction spikes are all different lengths. Can you show me an image full of stars with equal (displayed) spikes all over it? Perhaps the actual wording of the statement implied something to you that was not intended. No one has suggested that diffraction theory is wrong; diffraction assumes linearity. Your list of bullet points demonstrates that you weren't actually reading what people had written and you are inconsistent. You started off say there isn't stacking and now you say there is stacking. You talk about the central limit theorem but that involves unlimited exposure time, which will, of course, saturate a sensor. You hop from 16 to 32 bit quantisation and you ignore any effect of nearby stars. 16bits (any sampling and quantising aamof) introduces non-linearity. You state that stacking is inherently linear but a linear sum of many images is a very crude form of stacking. Each pixel of a stacked image can use and process (e.g. median) selected values from all available pixels. I can't see that is linear. We are stuck with FAPP and the simple maths fails at some stage. [/QUOTE]
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Diffraction Effects and Artifacts in Telescopes like the JWST
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