I have a problem and I need your help guys and gals. I have a Nikon d600 and a 70-200mm nikon lens, the problem is My last shoot was ruined due to the fact that when I got back to review my images I noticed they all were soft focused. I’ve included an example of the focus issue against a ruler sitting on a 45 degree angle. In these images I was focusing on the number 28. My 50mm prime lens seem to shoot just fine but I notice a bit of a halo or drop shadow to the 70-200mm lens images. I thought that I could correct the problem with the fine tune function of the camera but regardless of the focus point the drop shadow looking marks still appear. Is this a lens issue and if so what do I do? Is this user error or is my last hope to send it back to Nikon to see if it can be corrected?