Canon EF 16-35mm f/2.8L II USM review
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.