Astigmatism Effect on Fourier Transform
- Practical Electron Microscopy and Database -
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Astigmatism is a non-azimuthally-symmetric lens aberration. It can be described by adding an azimuth dependent term to the phase shift function. This term is given by, [page4236]

         Astigmatism effect on phase shift function -------------------- [1707]

The anisotropy of the astigmatism has the effect of averaging-out the higher frequency extrema in the radially averaged Fourier spectrum and thus depresses the high-frequency radial Fourier spectrum.




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