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I'd say the really exciting stuff happening in smartphones are the things going on with computational photography, like Apple's Deep Fusion. This is moving beyond the limitations of single lenses and single sensors and enabling some pretty impressive things.

> Many lenses from the 80s/90s hold their own compared to modern designs

Possibly in tele designs. There's been a ton of progress in wide-angle designs, and in fast normal lenses.

Of course these come at the price of expense and weight...

I really wish mobile camera reviews would have lens teardowns and commentary on the design tradeoffs made...

More people need to know about the engineering that went into them.