Point resolution
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The point resolution is determined by the first time the contrast transfer function passes zero. Contrast at higher spatial frequencies (higher resolution) becomes unpredictable. The information limit goes beyond point resolution limit for FEG microscopes.
Phase contrast images are directly interpretable only up to the point resolution (Scherzer resolution limit).
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![[1]](http://tiddly.vanwill.com/uploads/workspace/default/PointResolution.JPG){kind=link}