Panasonic 12-35mm F2.8 OIS is an Auto Focus (AF) Standard Zoom lens with FourThirds max sensor coverage. When mounted on a FourThirds sensor camera, it will give you an FF equivalent focal range of 24 - 70mm. With a max aperture of f2.8, this lens is fast on wide end and equally fast at 35mm with a max aperture of f2.8.
This lens features on optical image stabilization which helps capturing sharper images at lower shutter speeds. Panasonic 12-35mm F2.8 OIS is not a weather sealed lens, so you have to be extra careful against rain and dust.