Last year my NDX photos were all shot using my 30D. This year I only brought my 5D, and discovered how much more vignetting becomes a factor on a full-frame camera. Particularly with the NDX filter, its very very noticable.
And when combined with my Cokin filters (such as this graduated ND filter + polarizer) I had to zoom out to the 28mm seen here, or you could clearly make out the edge of the filter holder!
Amazingly wide!
