Rokinon FE75MFT-S 7.5mm F3.5 UMC Fisheye Lens for Micro Four Thirds (Olympus PEN and Panasonic) 180 degrees angle of view 9 elements in 7 groups Aperture range F3.5-22 Minimum focusing distance of 3.5 (0.09m)for enhanced close-up shots Approximately 1.9 inches long