This Tamron-made lens is equipped with auto focus for best possible result. With the image stabiliser you won't have to carry around a tripod to get sharp images.
From Camix
Tamron 18-400mm F3.5-6.3 Di II VC HLD For Nikon F [Brand New]
OnBuy
Tamron B028N 18-400 mm f3.5-6.3 Di II VC HLD Lens for Nikon