Buy from Amazon.com : http://fave.co/19wqmD4

Olympus M. Zuiko Digital ED 12mm f/2.0 Lens for Micro 4/3 Cameras (Black)

Product Description :
Ultra-wide angle fast aperture lens
Maximum f20 aperture great for low-light shooting
24mm equivalent field of view great for street shots or landscapes
Premium metallic construction throughout
Snap focus ring with distance scale for manual focusing
Special all metal lens hood and cap optionally available