I'm using this combo. Corners do get darker and blurrier wide open and especially at 200mm. Doesn't bother me. Images still look great. I made a couple of presets in lightroom to quickly fix vignettes and it's just not an issue to me.
_______________________________________________________http://www.jonvandalen.com/newblogNikon D700Nikkor 70-200mm f/2.8 VRNikkor 50mm f/1.8Nikon SB-600 Flash
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