Inspiring, efficient, and wide Sigma 10-20mm f/2.8 IF EX DC HSM is designed for various photography needs including wedding, events, portraits, and landscape. The Sigma 10-20mm wide f/3.5 aperture throughout the complete zoom range is ideal for low light conditions. The ultra fast wide lens features hyper sonic motor (HSM) that promises quiet fast autofocusing. Although lightweight and compact. The Sigma 10-20mm f/3.5 delivers the ultimate performance and attain images with overemphasized perspective. With a fast fixed aperture makes photographing easier for the photographer who desire to accurately control their depth of field.