The Tokina AT-X auto focus fisheye lens has a focal length of 10-17mm. It is ideal for shooting wide shots of architecture and landscapes, and it is compatible with digital Nikon cameras. The images it creates provide a 180 degree view, which is more than the naked eye can take in. The aperture range is f/3. 5-4. 5. The auto focusing system is quick and quiet, to assist in capturing the shots you want. The lens is made with low dispersion glass to mitigate chromatic aberrations and distortions. Additionally, it is easy to clean as it is water proof. Plus, it is small and lightweight, which makes it easy to carry around.