Yippee after months of procrastination we have finally purchased a D800 , now we start all over again in search of a landscape lens. We are thinking that around the 17 -35mm focal length would suit us and have read reviews on the 16 - 35 F4 and 17 -35 F2.8. both are supposedly excellent lenses, great sharpness, good colour rendition etc. We like the 16 -35 F4 as it is a few 100 dollars cheaper but it supposedly has a bad barrel distortion problem at the 16 -19 mm end wide open. we would really appreciate some feedback from any users of either of these lenses or any suggestions of other options, thanks