Tamron 10-24mm f3.5-4.5 II LD is an Auto Focus (AF) Wideangle 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 16.5 - 27mm. With the max apertures of only f4.5 at 11mm, and f5.6 at 18mm, the lens is quite slow at both ends.
Tamron 10-24mm f3.5-4.5 II LD is not a weather sealed lens, so you have to be extra careful against rain and dust.