This question has been lingering in my mind after I surfed through this forum: Why does a f2.8 (or any faster lenses) cost more than the "normal" (eg. 4.5, 5.6) versions?
Other than usability in low light, made of better quality plastics and bigger glasses and a gold/red rim, what makes them cost a bomb? After all, it's fixed aperture right, do they have any blades to start with?
I don't know if this has been discussed, but it's pretty hard to find given the many keywords... sorry if I sound noobs. Thanks.