Tokina 50-135mm f2.8 DX is an Auto Focus (AF) Telephoto Zoom lens with APS-C / DX max sensor coverage. When mounted on a APS-C / DX sensor camera, it will give you an FF equivalent focal range of 75 - 202.5mm. With a max aperture of f2.8, this lens is fast on wide end and equally fast at 135mm with a max aperture of f2.8.
Tokina 50-135mm f2.8 DX is not a weather sealed lens, so you have to be extra careful against rain and dust.