Focus series
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As the Contrast transfer function is determined by the Cs lens abberation (which cannot be influenced) and the focus (which can be influences) it is possible to increase the resolution to the information limit by creating a focus series.
[img[1][EmbeddedImages]]
![[1]](http://tiddly.vanwill.com/uploads/workspace/default/FocusSeries.JPG){kind=link}