Presenting an ultra-wide field of view with advanced perspective and focus control, the TS-E 17mm f/4L is a Canon L-series tilt-shift lens well-suited to architecture and interior photography. Up to +/- 6.5° of tilt is possible, for focus control, and +/- 12mm of shift, to adjust perspective and composition. The tilt-shift mechanism can be rotated +/- 90° for applying movements in any direction, and a tilt-locking mechanism can be used while shooting for greater stability. Complementing the operation of the lens, this L-series prime is also distinguished by its optical design that features four of Ultra-Low Dispersion elements to significantly reduce color fringing and chromatic aberrations as well as one aspherical element to minimize spherical aberrations and distortion. Individual elements also feature a Subwavelength Coating to suppress flare and ghosting for greater contrast and color neutrality. Additionally, a floating optical system and a rear focus design help to maintain consistent image quality throughout the focusing range, from 9.8" to infinity. Perspective control, tilt-shift lens affords +/- 12mm of shift and +/- 6.5° of tilt, and both types of movements can be applied independently, and parallel or perpendicular to one another. Additionally, the tilt and shift functions can be rotated +/- 90° for applying the movements in distinct directions. Tilt-locking mechanism ensures the lens stays in place while shooting. Four Ultra-Low Dispersion elements are used to greatly reduce color fringing and chromatic aberrations in order to achieve greater clarity and color accuracy. One aspherical element limits distortion and spherical aberrations to realize greater sharpness and accurate rendering. A Sub Wavelength Coating has been applied to individual elements to control lens flare and ghosting for greater contrast and color fidelity when working in strong lighting conditions. Floating optical system, along with a rear focusing mechanism, maintains consistent image quality throughout the focusing range, from 9.8" to infinity. As a member of the esteemed L-series, this lens is sealed against dust and moisture for working in inclement environmental conditions. Rounded eight-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field techniques.