I really don't understand the test results comparing the Tamron to the Nikon. I own both of the and the Nikon is far, far superior in quality and results. I will never buy another Tamron lens but I love the Nikon 70-200 f/2.8. Not a scientific test but real life use has proven to me that Nikon is a far better lens. It focuses much faster and the AF does not fail every few uses like the Tamron.