Originally posted by glennm i never said you could make a crappy lens great. poor lenses existed in the film days and they would still be poor in digital, ff included. i would like to be shown though why superior film days lenses would not still be superior if mounted to a ff digital system.
No you didn't say 'crappy lens', correct. BUT YOU DID NOT SAY SUPERIOR LENS ON FF DIGITAL EITHER. Yes, I would suspect with absolutely every thing else being equal that would be superior. You
did say "The benefit of FF is that you can hang so-so glass on the camera and make images superior to APS-C systems with the best glass."
So-so denotes what? Any combination of:
poor light transmission requiring any combination of higher iso, wider aperture or longer shutter
some tinting of the light transmitted thru it
from soft when at or near wide open to just plain soft and not even ever sharpening-up all that much
and/or dramatic drop-off in sharpness at the edges and more-so at the corners. (effect of which which FF will magnify)
chromatic aberration (often of the lateral form)
purple fringing
....and there's
no way a lens offering
some degree of those failings [i.e. "
so-so"] is going to be superior to the best glass used on our cropped sensors just because a FF sensor was used. [!] So just 'cuz you've read things and someone wrote something to the effect of what you quoted above does not make it correct and true. ... being another one of those "I'm gunna switch if Pentax doesn't..." guys doesn't work to your favor either. Maybe you just should switch if you can't be happy with what you have and you instead think it's solely the tool that's going to give you the breathtaking photographs we all strive for.