At first glance this zoom a beautiful design is well built, lightweight and compact for a powerful focal length (300mm). Its stabilization is effective and very nice. Unfortunately autofocus AF operation is fairly random, we must check again the focus point before shooting. Furthermore it severely under-exposed regularly while my camera Nikon D300 correctly exposed with other Nikon zoom lenses, Tamron and Sigma in my collection. So I think I had the misfortune to fall on a bad run of manufacture (made in China to my chagrin, when most Tamron are made in Japan). So I sent it back to Amazon. Morality, always check the operation of the equipment upon receipt.
