About this item 16 35mm ultra wide angle zoom lens with f/2.8 maximum aperture 3 high precision aspherical lens elements produce superior image quality, Closest focusing distance: 0.92 feet Circular aperture produces natural background blur at wider apertures, Ring type USM for fast and quiet autofocusing; internal focusing Measures 3.5 inches in diameter and 4.4 inches long; 1 year warranty
