I have the Nikon 70-300/4-5.6 ED and it is terrible at 300mm/5.6. So\nI'm considering replacing two Nikon zooms for the Tamron XR. I guess\nit's now called the Tamron AF28-300mm/3.5-6.3 XR DI LD Aspherical IF\nMACRO lens. The magazines (especially PopPhoto) and other testers say\nthe Tamron's a hit. But I've seen no photo comparisons between the two\nlenses. Is there such a comparison somewhere on the internet? Has\nanyone done a comparison and, if so, is the Tamron really that great?\nThanks.