> I believe the U curve he's seeing reflects the process of DSLRs transitioning from being an equipment restricted to professionals, getting popular during the

> I believe the U curve he's seeing reflects the process of DSLRs transitioning from being an equipment restricted to professionals, getting popular during the 90's/2000's (pressuring manufacturers to produce cheaper, more lightweight lenses), and finally transitioning back to professional equipment, as cellphones and smaller cameras picked up on image quality. IDK about that analysis, amateur photography wasn't invented by the digital age. Nikon and Pentax both have a lot of small and light primes and zooms.