Having retired almost a year ago from Zemax, I've been thinking about what, if anything, I can contribute to the teaching of lens design. So, I have set up Design Optics Fast, a YouTube channel dedicated to teaching 21st century optical design methods. There will be lots of short, easily understood lessons on how to design real-world optics, real fast. Please come and join me!
There is an introductory video here: https://youtu.be/XPjK4bBhD30
and the first section, on the Basic Shapes of Imaging systems is here: https://youtu.be/RhIRUtR0l6I
I'll be adding the next section, on optimizing the Basic Shapes soon. Please like and subscribe to the channel on YouTube if you find these useful.