The Tokina 10-17mm f/3.5-4.5 AT-X Fisheye Zoom for Nikon DX is a rectangular fisheye lens for Nikon crop-sensor cameras. Key features include:

Rectangular Fisheye Zoom. The Tokina 10-17mm f/3.5-4.5 AT-X DX Fisheye Zoom is a 10mm fisheye lens with a full 180° field of view. That would be interesting on its own; however, this is the first fisheye zoom with a focal-length range to 17mm, at which point it has a less “fishy” 100° field of view.

High-Quality Optics. This lens features one extra low-dispersion element to promote sharpness while limiting chromatic aberrations. Its water-repellent coating helps to prevent smudges and water spots while making the lens easier to clean.

Crop-Sensor Only. This is a most interesting lens, but it’s only for crop-sensor cameras.