the spherical aberration. The reason why the microscope has to be operated with a certain value of residual aberration is that atomic-resolution electron microscopy is mainly based on phase contrast.

Researchers at the University of Illinois at Urbana-Champaign have shown for the first time that expensive aberration-corrected microscopes are no longer required to achieve record-breaking ...

Stereo microscopes are very handy tools ... Its design is not plan-apochromatic and that causes significant chromatic aberrations, especially when trying to capture photographs.

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Aberrations can be caused by small imperfections in lenses and other optical components or by flaws in the sample under the microscope. The key to adaptive optics is a "guide star"—a bright spot ...