This ultra wide-angle Tokina AT-X 107 AF NH Fisheye 10-17mm f/3.5-4.5 Lens delivers the ultimate in wide-angle drama for your Canon camera. A 180' view at the 10mm setting takes in more than the human eye sees, with a typical dramatic curvature of field. At the 17mm end of the zoom, it's a very wide-angle lens.This lens may be used with cameras using APS-C size sensors, and with cameras using full-frame sensors. A full corner-to-corner image can be achieved on a full-frame (FX) camera between approx. 14.5-17mm depending on the camera model--at 10-14mm the image doesn't cover the entire frame, and there's a semi-circular view. Additionally, this NH (no hood) version of the lens lacks a built-in lens hood in order to provide greater coverage and less vignetting on full-frame cameras, as well as to extend the lens's compatibility with underwater housings.