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, This model is compatible with all current Nikon cameras (both DX and FX) Ring-type ultrasonic-type AF motor with full-time manual focusing 67mm filters,0.30m/11.81" minimum focus. Maximum Magnifications-1:5.2. Angle of View-63.4º Available in Canon EF, Nikon F (FX), Pentax KAF3, Sony Alpha, Sigma SA mounts. Please refer the User Manual which is in the Product Box before use.