The whole question of lens sharpness...

Started Jun 12, 2013 | Discussions thread
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olliess Senior Member • Posts: 1,167
Re: Counterexample

Alphoid wrote:

If you believe lens blur "resembles diffusion in a mathematical sense," can you please give a diffusion process, as per the links you gave, which has a PSF which is a solid octagon? It is trivial to design an optical system with this (I'll use your made-up terminology here for humor value) "blur function."

It isn't the precise shape that is the resemblance. It's the existence of a kernel, which in the heat equation has time dependent radial spreading, and for the lens has focal distance dependent change (not necessarily just spreading).

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