Sigma 10-20mm f/4-5.6 EX DC HSM Lens - 10-20mm focal length - F4-5.6 maximum aperture; F22-32 minimum - Ring-type ultrasonic-type AF motor with full-time manual focusing - 77mm filters - 0.24m/9.45" minimum focus Great quality, has infinity focus on it which makes it great for landscapes. I replaced this lens with a canon wide lens so I no longer need this one. Text or email please