Sigma 340306 35mm F1.4 DG HSM Lens for Nikon (Black) - International Version (No Warranty) 35mm focal length, 52.5mm equivalent focal length on APS-C cameras, 56mm equivalent focal length on Canon APS-C cameras F1.4 maximum aperture; F16 minimum Ring-type ultrasonic-type AF motor with full-time manual focusing 67mm filters 0.30m/11.81" minimum focus