The presence of the "virtual aperture" created by the damping
envelopes imposes a resolution limit on the microscope:
Information limit goes well beyond point resolution limit for FEG
microscopes (due to high spatial
and temporal coherency).
For the microscopes with thermionic electron
sources (LaB6 and W), the info limit usually coincides with the point resolution.
Phase contrast images are directly interpretable
only up to the point resolution
(Scherzer resolution limit).
If the information limit is beyond the point
resolution limit, one needs to use image simulation software to
interpret any detail beyond point resolution limit.