Assessing by weight seems like a pretty obvious-ish way to assess.
We could also do by volume? That would probably be even worse on iPhone's claim; I feel like phones are pretty dense? Lenses certainly can be, filled with heavy glass, but now a days there's also a big drive to make lenses lighter; reviews these days often have people surprised how relatively lightweight even a sizable lens is. It'd be fun to have total volume as a standard consumer spec item, so we could calculate average density.
Assessing by weight seems like a pretty obvious-ish way to assess.
We could also do by volume? That would probably be even worse on iPhone's claim; I feel like phones are pretty dense? Lenses certainly can be, filled with heavy glass, but now a days there's also a big drive to make lenses lighter; reviews these days often have people surprised how relatively lightweight even a sizable lens is. It'd be fun to have total volume as a standard consumer spec item, so we could calculate average density.