Olympus M 17mm f2.8 Pancake 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 34mm. With a max aperture of f2.8, this is a fast lens.
Olympus M 17mm f2.8 Pancake is not a weather sealed lens, so you have to be extra careful against rain and dust.