Wide angle zoom lens series tokina at x pro fx lens mount canon ef lens speed 4 focal length 17 35 mm zoom factor 21 times suitable for sensor types aps c full frame construction zoom lens area of use landscape photography close up photography focus internal focus auto focus manual focus af motor ultrasonic motor usm max magnification 14 8 closest focusing distance 28 cm lens types sld aspherical lens construction groupselements 1213 nu