Quote Originally Posted by Satinsnow

Something weird is going on, I have looked as several reviews by users on this lens around the net and no one has mentioned the problem you are having, are you sure your not having a different problem? Are you using it with filters? I have seen normal thickness filters cause this problem even on manufacture lenses and had to go to a thin filter to prevent it.

Just wondering.

Just a UV filter...nothing to interfere with the angle of view; not even a lens hood...
I'm not certain where it starts vignetting; probably somewhere around 35mm, but its damned annoying. Some of my shots can be enlarged to push the effect outside the print. But some of the landscapes (which is the primary reason for wanting the WA) are pretty much toast!