![]() However, next I evaluate the focal power for the different field points in the Merit Function. Indeed, the Power Field Map tool the contour lines for a fixed focal power seem to be circles. I expect the focal power in each of the three field points to be identical, since the lens is rotationally symmetric. The last field is a diagonal field coordinate with the amplitude 30° (30°/SQRT(2)=21.213°). In the attachment, I have a simplified version with a spherical lens to illustrate the issue that I am seeing. ![]() I don't fully understand how the normalized field coordinates work for e.g. I have a model of a lens and want to look at the focal power at different field angles.
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