Rokinon T-S 24mm f3.5 is a Manual Focus (MF) Perspective Control 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 24mm. With a max aperture of f3.5 at 24mm, this is a moderately fast lens.
Rokinon T-S 24mm f3.5 is not a weather sealed lens, so you have to be extra careful against rain and dust.