It's none of my business, but I use the 85mm and the 55mm Otus and love the increased resolution over any of the Nikon lenses. I was hesitant at first since it was not AF, but not now--I always use on tripod and always use Live-view, treating my 810 as a view camera, but then I'm a landscape photographer so speed not high on my list. Anyway, anyone seeing this post, I don't know the seller but giving my strongest recommendation for the lens--I wish Zeiss had more focal lengths in this kens.