Canon EF-S 15-85mm f/3.5-5.6 IS USM UD Standard Zoom Lens for Canon Digital SLR Cameras Focal length and maximum aperture: 15-85mm 1:3.5-5.6 Lens construction: 17 elements in 12 groups Diagonal angle of view: 84 Degree-30 ft. - 18 Degree-15 ft. Inner focusing system with USM focus adjustment Closest focusing distance: 0.35m/1.2 ft.