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Chapter 4:
Primary Aberrations
In previous Chapters, comments were made about imaging aberrations. This means that a lens has shortcomings with respect to imaging a point as one without degradation. This degradation is due to aberrations defined as 1. Spherical aberration. 2. Axial chromatic aberration. 3. Coma. 4. Astigmatism. 5. Field curvature (Petzval curvature). 6. Distortion. 7. Lateral color. When determining aberration size, we will refer only to expressions which relate to the so-called thin lens third-order aberration theory. This theory is based on truncation of a sine series to the third order to simplify the calculations.
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