Sigma 16mm F1.4 DC DN Micro Four Thirds 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 32mm. Providing a max aperture of f1.4 at 16mm, this lens is very fast.
Sigma 16mm F1.4 DC DN Micro Four Thirds is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.