I created this to help explain why lens design is so complex. This is a trivial illustration, but it touches on a FEW of the key principles that explain why designing lenses is really a years long process. I’d love any feedback you may have on the subject. If you know more about lens design than me (and you have a degree or achievement to back it up), then please correct me where I’m wrong. My knowledge, while more than most, is still highly limited.
*Bonus points to anyone who can name the camera company that misleads their customers by selling extreme fast lenses (e.g. f/1.2) which can never be tack sharp wide open at certain focus distances