I've had the 5D3 for 3 days and I'm loving it so far. Despite one big major pitfall. While the AF is lightning fast, it seems to produce soft images. I had issues with 50-70% of my images turning out very soft, even in controlled conditions. I decided to print out a focusing chart and see if my lens was back/front focusing. Turns out in my test, it was severely backfocusing. Corrected the probably (-15 af fine tune) and was in love with what I was getting with anything 4-8 feet away from me. Then I took a picture of something further away, and now it severely back focuses. As in, the camera/lens need the AF fine tune with close subjects, but not with far subjects. So how do I calibrate for back focusing when I'm close to my subject, but then normal or front focusing when I'm far from my subject.