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=== Scherzer Defocus ===
The defocus value (<math display="inline">z</math>) can be used to counteract the spherical aberration to allow for greater phase contrast. This analysis was developed by Scherzer, and is called the Scherzer defocus.<ref>{{Cite journal|url = http://scitation.aip.org/content/aip/journal/jap/20/1/10.1063/1.1698233 | doi = 10.1063/1.1698233 |title = The theoretical resolution limit of the electron microscope|last = Scherzer|first = |date = 1949|journal = Journal of Applied Physics|pmid = |access-date = |volume=20 |pages=20|bibcode = 1949JAP....20...20S }}</ref>
<math>z_s = (C_s\lambda)^{1/2}</math>
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