Chris, another thing, you can usually tell in camera vignetting vs. post processing by the amount of "feathering" that is present. Most people that add it during the processing will feather it so it falls off more gradually. With in camera, you tend to have a harder vignette especially as you work your way through the apertures. You can also tell by the amount of detail in the vignetted area. In processing you are simply darkening the edges, where in camera it is actually an optical cause and detail gets lost. Thanks again.
