I'm sorry, I meant to say 24-70mm! I also tested my 24-70mm f2.8 and attached are the two FocusTune used with LensAlign PDF printouts. I also tested it at 45mm and got a result of +5! Totally confused I reset fine tune to zero, took and image towards a flat target with elevated shutter speeds at f8 and sharp as a tack.
Once again I am not critising AF-Fine tune, but my experiences.