i went through the very same thing about two years ago... i wanted a great 210 that took 67mm filters. so, i bought a bunch of them and tested them, and the two i liked best were the APO Symmar and the Sironar-S. in the end i went with the Rodenstock for no other reasson than my 150 at the time was also a Sironar-S... it's now a Super Symmar - so much for planning! anyhow, i stepped the native 72mm filter size DOWN to 67mm, and never noticed any vignetting on 4x5. mark's 210 APO Symmar here on APUG looks like a very good deal!