Samyang 12mm F2.8 Ultra Wide Fisheye Lens for Pentax DSLR Cameras- Full Frame Compatible Full frame sensor coverage with extreme ultra-wide 180 degrees angle of view on full frame cameras Nano Crystal Coating System (NCS) + Ultra Multi Coating (UMC) Maximizes Transmission and Reduces Internal Reflections Constructed of 12 glass elements in 8 groups with aperture range of f2.8 - f22 Includes removable petal shaped lens hood, lens caps, lens pouch, instruction manual and 1 year Rokinon warranty Minimum focusing distance of only 7.9 inches