i've been thinking about this for a while na. honestly, confused ako dito. hehe
kasi, so what kung may crop factor? 16mm on full frame is indeed wider than 16mm on a crop sensor. BUT meron namang 10mm for crops that match the field of view of 16mm on full frame.
the advantage is that what's wide on crop is extra wide on full frame.
what's long for a crop is short though for full frame naman.
so i don't quite get it.
in terms of bokeh though, medyo gets ko.
let's say 85mm @ 1.8. grabe bokeh nun on full frame. but on crop naman, di mo masusulit.kasi nga naccrop yung bokeh. but you can get it on a 50. would it be the same kind of bokeh though? i'm not sure... given it's the exact same kind of lens all things being equal, maybe yeah but are lenses made equally? i dont think so...
it's real confusing. hehe
in terms of noise control though, malupit na malupit talaga yung 5d. but people are saying that the 40d comes close. how close i dont really know. there are several tests online that you can check out.