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. 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. 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. Four Ultra-Low Dispersion elements are used to greatly reduce color fringing and chromatic aberrations in order to achieve greater clarity and color accuracy. 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. As a member of the esteemed L-series, this lens is sealed against dust and moisture for working in inclement environmental conditions.