02-10-2017, 06:53 AM
So sorry, I forgot the conclusion for the elderly amongst us 
: Given the prices for raw-materials, for the manufacturing of very precise moulds and the machinery producing high-tech plastics, given all that, metal is the cheap version and plastic the expensive which saves a lot of weight. It's an old and from the beginning of plastic age coming idea, that plastic quality per se is never up to that of metal. I'm not entirely disagreeing with that, it just depends. And the manufacturers learnt "you can cram the cheapest plastic parts into a nicely looking metal shell and some most people will defend them til the death" ^_^
Nikon 300/4 PF E: 755 grams
Nikon 300/4 IF ED: 1440 grams
Olympus 300/4: 1270 grams (and not even made for FF...)
It says something that the weights for bodybuilders are made of metal, not of plastics
"Most metal lenses"... I own 5 with metal focus rings but then, the body to use them is only specified to -10° which is just a bit fresh.
: Given the prices for raw-materials, for the manufacturing of very precise moulds and the machinery producing high-tech plastics, given all that, metal is the cheap version and plastic the expensive which saves a lot of weight. It's an old and from the beginning of plastic age coming idea, that plastic quality per se is never up to that of metal. I'm not entirely disagreeing with that, it just depends. And the manufacturers learnt "you can cram the cheapest plastic parts into a nicely looking metal shell and some most people will defend them til the death" ^_^Nikon 300/4 PF E: 755 grams
Nikon 300/4 IF ED: 1440 grams
Olympus 300/4: 1270 grams (and not even made for FF...)
It says something that the weights for bodybuilders are made of metal, not of plastics
"Most metal lenses"... I own 5 with metal focus rings
but then, the body to use them is only specified to -10° which is just a bit fresh.