[Calvertp]

Hello - I'm new to photozone, bu was really impressed by the in-depth reviews. I have just received a brand new Canon EOS 7D and EF-S 17-55mm IS USM. I am generally delighted with the 7D and the 17-55, but have found some significant vignetting at wide aperture and shorter zoom. All four corners of images fall off gradually, and significantly. I realize some vignetting is to be expected under these conditions, but wonder if what I am experiencing is beyond expectations (i.e. did I get a lemon, either in the camera body or lens)? I've included a sample image below:



[url="http://www.flickr.com/photos/54159846@N08/5005674256/"]Sample photo[/url]



The photo was shot at 17mm, f/6.3. Additionally I have a UV filter and a polarizer attached (both from Crystal Optics).



Any comments would be greatly appreciated!