Combines the special effects advantages of 180-degree coverage with Nikon's advanced D-type autofocus lens technology. Bright f/2.8 aperture for photographing in dim light or with fast shutter speeds. Full-aperture viewing and metering. Four 39mm filters bayonet onto the back of the lens. High-contrast images even at full aperture. Exceptionally lightweight for a fisheye lens. Built-in lens hood.