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"Hi all, \n  \n\n  \nI would disagree on the point of \"losing very little\" between D800/D810 in FX mode and the D500. This is of course based on shooting all three cameras underwater a fair bit now! However, that is a discussion that we are best having somewhere else.  \n  \nI would absolutely agree that there will be no vignetting or port shade in the image with the D800/D810 and this lens at 15mm. Equally I would tend to agree that the optical quality on this lens is much superior to that of the Tokina 10-17mm. This is especially true if the Tokina is combined with a TC on an high resolution FX camera like the D810. Build quality seems also to be in a different league. Most of us have had at least one Tokina come apart on us! \n  \nStrictly technically, the Sigma does actually focus closer than this lens (by 1cm). I note that Nikon list the FOV of the lens at 175° at 15mm on FX. The Sigma has an FOV of 180°. That 5° difference in FOV probably explains the lack of vignette. \n  \nThe D810 images above were with a Seacam Compact port (170mm). I have used the Sigma with this port a lot and there is no vignette at any aperture. It is amazing to think that 10mm of difference in diameter produces such a difference. It is a salutory tale for anyone considering dome port choices. \n  \nAdam \n"
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