This is known to most people looking at photography forums.... but here is an example. Shot with the 70-200VR lens @2.8 to show vignetting. This is a problem at all focal lengths fully open (dark corners of the picture, not completely symmetrical). Even if the problem can easily be solved in post processing for instance with Photoshop or Nikon Capture NX, it is a bit annoying to have such a problem with a pro lens on a pro camera. This seems to be common on full frame cameras. Maybe Niknn could do something to either improve their lenses or to do some automatic in camera processing to compensate.