Olympus M.Zuiko Digital ED 45mm F1.2 Pro is an Auto Focus (AF) Telephoto Prime lens with FourThirds max sensor coverage. When mounted on a FourThirds sensor camera, it will give you an FF equivalent focal range of 90mm. Providing a max aperture of f1.2 at 45mm, this lens is very fast.
Olympus M.Zuiko Digital ED 45mm F1.2 Pro is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.