If you want to play with any of these lens descriptions (or look at code for simulating them), I made a free and open source visual web UI for lens design. The default project when you visit it is a double gauss lens similar to the one shown in the article.https://alexbock.github.io/open-optical-designer/
cwmoore|9 months ago
alexbock|9 months ago
Rotundo|9 months ago
librasteve|9 months ago