Optics 101

Optical Aberration - Astigmatism Aberration

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Dec 7 2007

Astigmatism aberration is an aberration condition which is more dependent on the angle of the beam of light. Astigmatism aberration is similar to comatic aberration. The only difference between astigmatism aberration and comatic aberration is that astigmatism aberration is less sensitive to the size of aperture.

Astigmatism aberration is a result of an off-axis image of a point of specimen which appears as an ellipse of a line rather than a point. The image of line can be pointed in any of the two directions, tangentially or sagittally.

Astigmatism aberration is located in an uncorrected lens near the outer regions of the field of view. Astigmatism aberration causes an ideal circular image to become unclear into a diffuse circle. Depending upon the focal plane location, it can also be an elliptical patch or a line.

Source: AZoOptics

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