The M.Zuiko Digital 17 mm f/2.8 is a wide-angle, pancake-style prime lens by Olympus Corporation, for the Micro Four Thirds System. It is sold in a kit with the Olympus PEN E-P1 camera body and available separately. The optical scheme has 7 lenses in four groups; two of these lenses are aspherical. Different reviews and tests valued the total optical quality as moderate to good, but far from superior. Still, the compactness and total performance make some good reputation for this kit lens.