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Hi all, 



OpticStudio can output relative illumination very quickly and accurately from the perspective of the exit pupil's rays, but if you would like to control the relative illumination of a lens system without over-constraining the system, you may be interested to know what else is being optimized as you target relative illumination in the merit function. For example, things to impact relative illumination include image distortion, differential distortion, and the size of the entrance pupil. Here's one way to do it: https://doi.org/10.6084/m9.figshare.13488891



Cheers, 



~ Ronian

This is a great point Ronian. I often think it's not realized to what extend RELI and DIST are the same thing, or at least two sides of the same coin. The way to control relative illumination is to introduce distortion to control the ray density as a function of field, and vice versa. It's usually a mistake to optimize RELI and DIST simultaneously. If you get the distortion you want, you'll get whatever the RELI is.

Thanks, Mark 🙂 Yep...and it's another reason to keep learning aberration theory (a never ending journey!)

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