Olympus ED 12mm f2 is an Auto Focus (AF) Wideangle Prime lens with FourThirds max sensor coverage. When mounted on a FourThirds sensor camera, it will give you an FF equivalent focal range of 24mm. Providing a max aperture of f2 at 12mm, this lens is very fast.
Olympus ED 12mm f2 is not a weather sealed lens, so you have to be extra careful against rain and dust.