If you like this sort of thing I highly recommend seeking out a hardcover copy of the last edition of a long-running book, View Camera Technique: 7th Edition. I found it exceptionally well illustrated and very interesting.
Somebody in Dongguan once introduced me to the Korean running the iPhone lens assembly production systems (it was outsourced; ~COVID). IIRC they had 13 lens elements at the time and each assembly was characterized and digitally corrected according to its specific optical characteristics. Fascinating guy to talk to over beer. He moved east after that, someplace near Shanghai IIRC.
https://www.amazon.com/View-Camera-Technique-Leslie-Stroebel...
Somebody in Dongguan once introduced me to the Korean running the iPhone lens assembly production systems (it was outsourced; ~COVID). IIRC they had 13 lens elements at the time and each assembly was characterized and digitally corrected according to its specific optical characteristics. Fascinating guy to talk to over beer. He moved east after that, someplace near Shanghai IIRC.