Optical Axis of Microscopes
- Practical Electron Microscopy and Database -
- An Online Book -


This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.


Generally speaking, an optical axis is a line along which there is some degree of rotational symmetry in optical systems such as a microscope and camera lens. In the case of light-optical microscopes with a thin, glass lens the optical axis is perpendicular to the plane of the lens and passes through the center of the rotational symmetry of the lenses. Based on this sense, there is only one point at which the optical axis passes through a specimen, that is, only one point of the specimen is on the optical axis. However, in electron optics, it is difficult to identify the location of the optical axis for several reasons; for instance, it is hard to produce a lens that has perfect rotational symmetry. In more practical terms, any point of the specimen that happens to be at the center of the field of view can actually act as one point called optical axis even though it is not ideal.




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