This 11.1x high zoom ratio lens incorporates Sigmas original OS function & offers a broad shooting range from wide angle to telephoto The latest optical technology enables easy handheld photography with a compact construction & length of just 87.7 mm, making it ideal for various scenes such as landscape, sport & general photography. The compact construction guarantees excellent mobility making ideal for travel photography. FLD ("F" Low Dispersion) glass, which has performance equal to fluorite, SLD (Special Low Dispersion) glass elements & aspherical lens elements provide high image quality throughout the entire zoom range. Sigmas HSM (Hyper Sonic Motor) ensures fast & quiet auto-focusing. This lens features the latest optical technology including FLD glass elements & aspherical lens elements, making it compact with a length of just 87.7 mm. whilst keeping high rendering performance. This compact construction guarantees excellent mobility with superior image quality. One FLD ("F" Low Dispersion) glass element, which has performance equal to fluorite & two SLD (Special Low Dispersion) glass elements provide excellent correction for color aberrations. Two glass mold aspherical & one hybrid aspherical lens elements ensure excellent correction for all types of aberrations. Together they provide a high level of optical performance throughout the entire zoom range.