With a tilt and shift mechanism built-in, this lens greatly expands the expressive range of any EOS camera, allowing them to do what use to be possible only with medium and large-format cameras - correcting perspective distortion and controlling focusing range. This means you will have all the mobility of a 35mm or digital SLR, as well as automatic aperture control, which allows AE photography with AEB (Auto Exposure Bracketing). It compensates for astigmatic and other aberrations thanks to a ground and polished aspherical lens element. A floating mechanism incorporated into the design preserves high image quality throughout the focusing range from 0.3m / 1ft. to infinity, while simultaneously reducing the size and weight of the lens. This lens is particularly useful when taking photographs of building interiors and exeriors, landscape shots, and other wide-angle scenes.