Tamron has officially announced the 100-400mm f/4. 5-6. 3 Di VC USD. The new lens will begin shipping on November 16, 2017. You can preorder the new Tamron 100-400mm f/4. 5-6. 3 Di VC USD at B&H Photo for $799.
Press Release: Tamron announces the launch of a new ultra-telephoto zoom lens with fast and precise AF, superior image quality Read more. . . . canonrumors.com