I started to worry about the auto focus on my D800 so I checked it out on a stationary object with my 24-70,14-24,70-200 and 105 macro. I used all f stops and for each lens used the bottom, top and mid range on the zooms. For the 105 moved from about 5 ft to the cloest possible. All the images were sharp as any camera I have owned. I am particularily impressed with the auto white balance. Sharpness drops off slightly at f16 and seems sharpest at about f8. The 105 stayed sharp even at f27. I won't be sending mine back to Nikon for this problem!