Visualising lens aberrations — two at a time, Siemens star

In the past few posts, we’ve looked at the visual effects of lens aberrations one at a time. In this post, I’ll expand that to include the compound effects of allowing the aberrations to take place in pairs. In the list of caveats that I posted a few days ago, I mentioned that I am ignoring phase. That is especially relevant when considering combined aberrations. The number of combinations of 7 things take 2 at a time is, gulp, 21. So there are a lot of images to look at.

LaCA, Coma