Panasonic Lumix G 25mm F1.7 ASPH is an Auto Focus (AF) Standard Prime lens with FourThirds max sensor coverage. When mounted on a FourThirds sensor camera, it will give you an FF equivalent focal range of 50mm. Providing a max aperture of f1.7 at 25mm, this lens is very fast.
Panasonic Lumix G 25mm F1.7 ASPH is not a weather sealed lens, so you have to be extra careful against rain and dust.