Rokinon 8mm F2.8 UMC Fisheye II (Black) Lens for Samsung NX Mount Digital Cameras (RK8MBK28-NX) Ultra Wide 12mm Fixed Focal Length; Includes removable lens hood, lens caps, lens pouch and 1 year Rokinon warranty Aperture range f2.0-22 Constructed of 12 elements in 10 groups (2 aspherical lenses) Minimum focusing distance of only 8 inches Built for Mirror less cameras; takes a 67mm filter size Fixed 8mm focal Length; Fisheye lens Aperture range of f2.8-22 New and improved optics and construction Constructed of 11 elements in 8 groups; built specifically for mirrorless cameras Minimum focusing distance of 1 foot.