This particular lens is equipped with auto focus to help you take that perfect picture. The filter size is 67 mm, good to know if you like to use filters.
From Amazon
Tamron 100-400mm F/4.5-6.3 VC USD Telephoto Zoom Lens for Nikon Digital SLR Cameras (6 Year Limited USA Warranty) Black
Clifton Cameras
Tamron 100-400mm F4.5-6.3 DI VC USD - Nikon