Originally posted by tibbitts When you say rubber-band centered, how did you accomplish that?
Paul
Just a wide elastic band around the barrel of the lens, focus/zoom becomes difficult, and don't even try autofocus.
This centers the wobbly front group for these tripod shots.
This problem with the disappointing corner performance is widely known, the dpreview test of this lens mentioned it also.
And even on my 6Mpixel *istD it shows on portret mode shots.
For landscape shots the decentering of the downward pulled front group is less harmful.