The TS-E 17mm f/4L Tilt-Shift Lens from Canon is an ultra wide-angle manual focus lens for EF mount cameras with a 104º diagonal angle of view on full frame cameras. It is the widest tilt-shift lens in the Canon lineup and provides tilt-shift functions to control perspective and correct convergence of lines within your frame. It is especially useful in architecture, landscape, and product photography. The optical tilt mechanisms enable precise control of depth of field along with perspective control.