B00TS9LAFS Samyang 12 mm T3.1 Fisheye VDSLR Manual Focus Video Lens for Micro Four-Thirds

Make sure this fitsby entering your model number.
Nano Coating System (NCS) reduces reflections and provides higher contrast
Extra low dispersion (ED) and glass aspherical lens (ASP) elements
De-clicked aperture movement and toothed focus and aperture rings provide smooth operation while shooting video.
Circular aperture with 7 blades