What do the field curvature and distortion plots measure?
The field curvature plot shows the distance from the currently defined focal (image) plane to the paraxial focal plane as a function of field coordinate. “Standard” distortion in percent is defined as the real chief ray height, minus the reference ray height, divided by the reference ray height, times 100. The reference ray height is computed by tracing a real ray from a very small field height, and then scaling. This generalization permits the computation of reasonable distortion values even for systems not well described by paraxial ray tracing. F-Theta distortion values are also available. See the definitions of field curvature and distortion in the “Analysis Menu” chapter of the ZEMAX online manual.
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