Tamron 200-500mm f5-6.3 LD 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 200 - 500mm. With the max apertures of only f5 at 200mm, and f6.3 at 500mm, the lens is quite slow at both ends.
Tamron 200-500mm f5-6.3 LD is not a weather sealed lens, so you have to be extra careful against rain and dust.