Olympus ED 8mm F1.8 Fisheye PRO is an Auto Focus (AF) Wideangle Fisheye Prime lens with FourThirds max sensor coverage. When mounted on a FourThirds sensor camera, it will give you an FF equivalent focal range of 16mm. Providing a max aperture of f1.8 at 8mm, this lens is very fast.
Olympus ED 8mm F1.8 Fisheye PRO is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.