From the ManufacturerBroaden your perspective with the Canon EF 16-35mm ultra-wide-angle zoom lens. Specifically designed for improved edge-to-edge image quality that meets the strict requirements of professional and high-end amateur photographers alike, the lens lets you bring more area into focus while providing greater depth of field. The lens features three high-precision aspherical lens elements--ground, replica, and GMo--that produce even better image quality than the original Canon EF 16-35mm USM lens. The circular aperture, meanwhile, produces a beautiful and natural background blur when shooting at wider apertures. Other details include internal focusing, a ring-type ultra-sonic monitor (USM), and new AF algorithms for fast and quiet autofocusing. The lens carries a one-year warranty.Focal length: 16-35mm Maximum aperture: f/2.8 Lens construction: 16 elements in 12 groups Diagonal angle of view: 108 degrees (at 10 feet) to 63 degrees Focus adjustment: AF with full-time manual Closest focusing distance: 0.92 feet Filter size: 82mm, P=0.75mm/1 filter Dimensions: 3.5 inches in diameter, 4.4 inches long Weight: 1.41 pounds The EF 16-35mm f/2.8L II USM is a high performance, water-resistant, and ultra wide-angle Canon L-series lens. It has been specifically designed for improved edge-to-edge image quality that will meet the strict requirements of professional and high-end amateur photographers. It features 3 high-precision aspherical lens elements, each of a different type: ground, replica and GMo for even better image quality than the original EF 16-35mm f/2.8L USM. The circular aperture produces a beautiful and natural background blur when shooting at wider apertures. Other features include internal focusing, a ring type USM (Ultra Sonic Monitor), and new AF algorithms for fast and quiet autofocusing.What’s in the box: Canon EF 16-35mm f/2.8L II USM Autofocus Lens, 82mm Lens Cap, Lens Dust Cap E (Rear), EW-88 Lens Hood for 16-35mm f/2.8L II USM, Lens Case LP1319 and 1-Year Warranty.