<p>Hi all, <br> I'll start by saying that I have no focusing issues anymore (seems like it at least) but something is very strange with how the AF fine tuning works and I wonder if anyone has come across this... (Apart from that I assume it might cause problems in the future)...<br> So I purchased a new Nikon D800E a few weeks ago and getting accurate focus was very hard especially at max aperture... so I only used f/4 and higher. The sharpness was still acceptable but not enough to my mind.<br /><br> Anyway, yesterday I decided to look at the AF fine tuning and was amazed - I had a really serious back focus with all of my lenses! (so it's probably a camera issue).<br> So I worked tethered with lightroom and zoomed in 1:1 on an object I photographed (it was simpler then using a ruler although I did that too). The shots were made with maximum aperture on a good monfrotto tripod.<br> Took around 200 shots on all of my three lenses and carefully checked each image with different fine tuning values until I saved those three values: <br> 24-70 2.8G: -16<br> 50 1.8G: -14<br> 85 1.8G: -16<br> So now's where things got strange - I've retested and re-edited the values I saved... the first shot with the saved value (before any re-edit) was ok. Then i changed from -16 to 0 (24-70 lens) and still the same (in the first tests it was completely out of focus), then to +20 and out of focus then back to 0 was good but back to -16 was out of focus (that's the value that should be good)... Then I switched the AF fine tuning OFF and still perfect focus (before I first touched the AF fine tuning that setting gave clear back focus)... Same thing with all other lenses so I simply deleted all saved values, but still focus is perfect with AF fine tuning turned either ON or OFF...<br> So I assume the values were stored some where but not completely deleted (unless I got the something wrong - but I really worked hard on this...). Or maybe they will be deleted sometime in the future when I do a complete setting restore in the camera or something like that...<br> Anyway, the thing that is really bothering me is that it's obvious that the camera has a back focus and if the AF fine tuning values that I saved and deleted were still stored and saved for these particular lenses then it's not going to solve the actual problem - which is the back focus of the camera... further more, I deleted those values but they weren't actually deleted...<br> Anyway, I wondered if anyone has come across this AF fine tuning behavior...<br> Thanks in advance,<br> Dror</p>