[Guest]

That's hardly a shot made at 11mm f/4 ... :-)

 

And it all depends on how you process the images. The vignetting figures represent the original output.

That's correct, it wasn't f/4, but who shoots landscape wide open? So, the vignetting might be technically there, but in practice it is no problem. By the way, the picture was only sharpened with DPP, no other post-processing was done. Coming from film photography, as a rule I hardly do any post-processing at all. For me a photograph must be complete when I push the button, not when I click the mouse ;-)