The Canon TS-E 17mm f/4L Tilt-Shift Lens is a tilt-shift lens in Canon EF mount with a maximum aperture of f/4 and a minimum focus distance of 25 cm. 

Tilt-shift lenses are commonly used in architecture and interior photography. The lens has a shift-change of +/- 12 mm to adjust your composition. To shift the focus, you can tilt +/- 6.5 degrees. To increase stability while photographing, you can use the tilt-lock mechanism. 

It weighs 820 grams and has no filter thread. The angle of view is 104°. The lens dimensions are 88.9 x 106.9 mm.