axial astigmatism
axial astigmatism
If an electromagnetic lens (objective lens) does not have perfect axial symmetry, a circular image of the light source (electron source) deforms to an ellipse image. This aberration is called "axial astigmatism." The axial aberration arises from asymmetry of the polepiece bore of the lens, magnetic non-uniformity of the polepiece material, charging on the aperture, etc.
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