Tamron SP 70-200mm 2.8 Di VC USD G2 is an Auto Focus (AF) Telephoto Zoom lens with 35mm FF max sensor coverage. When mounted on a 35mm FF sensor camera, it will give you an FF equivalent focal range of 70 - 200mm. With a max aperture of f2.8, this lens is fast on wide end, but max aperture of f22 at tele end makes is really slow at longer focal lengths.
Tamron SP 70-200mm 2.8 Di VC USD G2 is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.