Flipped an element in an old lens and got 'magic' bokeh (2018)
I would love to know from someone knowledgeable --<p>How is a new lens design made nowadays, and is there much innovation still in lens design?  I mean, seems like aside from zoom lenses, the designs were done (by hand! and slide rule) 100 to 50 years ago.<p>What do you do now?  Have a ray tracing linear solver with constraints about refractive index, desired weight, number of elements, distortions, etc. (and cost!) factor all these things in and see what multiple lens stack it comes out with?  Or is it just small variations on known proven designs now?