Olympus ED 40-150mm F2.8 Pro is an Auto Focus (AF) Telephoto Zoom lens with FourThirds max sensor coverage. When mounted on a FourThirds sensor camera, it will give you an FF equivalent focal range of 80 - 300mm. With a max aperture of f2.8, this lens is fast on wide end and equally fast at 150mm with a max aperture of f2.8.
Olympus ED 40-150mm F2.8 Pro is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.