Sigma 4.5mm f/2.8 EX DC AF HSM Circular Fisheye 486-306 | Sigma 4.5mm f/2.8 EX DC HSM Circular Fisheye Lens for Nikon Digital SLR Cameras Fast F2.8 maximum aperture making it ideal for low light photography l Minimum focusing distance of 13.5cm and a maximum magnification of 1:6 Equisolid angle projection |