I actually wrote a blog about shoosing the right lens about 2 weeks ago. In it, there's an image that I shot with the Canon 16-35mm L IS.
You can see it here... <photo link>
Even though it was shot on the 5D MkII and was at 16mm focal length, it didn't seem to show the vignetting that it does at full aperture - this image was shot af f22.
I'm sure there's some complicated optical explanation for that, but I just try to avoid shooting at full aperture - unless I want to vignette.
Good point Charlie.
Vignetting along the corners of images captured with ultra-wide angle optics can often be greatly reduced by stopping the lens down 2-3 stops, which also improves the overall sharpness of the image.
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