As a high performance, water-resistant and ultra-wide angle Canon L-Series lens, the EF 16-35mm f/2.8L II USM has been specifically designed for improved edge-to-edge image quality that will meet the strict requirements of professional and high-end amateur photographers.
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It's home to 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 auto-focusing.