A fisheye lens is a wide-angle lens that takes in an extremely wide angle of view. The Nikon 2148 AF DX Fisheye-NIKKOR 10.5mm f/2.8G ED lens was designed exclusively for NIKON digital SLR cameras that feature NIKON's DX Format Sensor. The AF DX Fisheye-Nikkor 10.5mm f/2.8G ED lens significantly expands NIKON's DX-Nikkor category of interchangeable lenses. Go beyond wide angle with this DX series lens for your Nikon DSLR. The actual focal length of 10.5mm is equivalent to that of about 16mm on a 35mm-film camera.