16-35mm ultra-wide-angle zoom lens with f/2.8 maximum aperture 3 high-precision aspherical lens elements produce superior image quality 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 16-35mm ultra-wide-angle zoom lens with f/2.8 maximum aperture 3 high-precision aspherical lens elements produce superior image quality
