DoF may not exist...

Started 3 months ago | Discussions thread
JimKasson
MOD JimKasson Forum Pro • Posts: 35,343
Re: Another approach...

Erik Kaffehr wrote:

But, the nice thing that in the frequency plane all MTFs multiply. So all PSF have an effekt, except when one component goes to zero, in that case MTF for the system is zero.

This is only an approximation, and one that doesn't work very well in estimating the effects of various kinds of lens aberrations. It works better with diffraction and pixel aperture, though. We have dropped the phase plane to get from PSF to MTF, and for accurate estimations of combined effects, we'd have to multiply the Fourier transforms of the component PSFs, not the absolute value of those components.

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