Sigma 150mm F2.8 EX DG Macro HSM is an Auto Focus (AF) Macro Prime 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 150mm. With a max aperture of f2.9 at 150mm, this is a moderately fast lens.
Sigma 150mm F2.8 EX DG Macro HSM is not a weather sealed lens, so you have to be extra careful against rain and dust.