This 18-35mm f/1.8 DC HSM Lens is a versatile Art-series zoom lens from Sigma that is uniquely fast and designed to cover wide-angle to normal focal lengths and fit Canon cameras with EF-mount. This lens has a constant maximum aperture of f/1.8 that is quite bright, making the lens suitable for use even in difficult lighting conditions and offers impressive depth of field control throughout the zoom range. The optical design incorporates a series of SLD and aspherical elements that help to achieve high clarity and sharpness, color fringing, and distortion. Lens flare and ghosting is controlled via the application of a Super Multi-Layer Coating for improved contrast and color accuracy. This lens also sports an advanced Hyper Sonic Motor, along with an internal focusing design, to promote fast, quiet, and precise autofocus performance.