The Canon EF 16-35mm f/2.8 is one of the best low light wide angle lenses available. The fact that it is a zoom lens, ranging from super wide to standard field of view, makes it an excellent addition to any kit, and for many landscape and architectural photographers, the only lens they take to work. In this video, Ken Taranto takes the 16-35 to work on a building site that he has been documenting for almost twenty years. He shows us the differences in the focal lengths and demonstrates how at 35, the lens can even be used for portraits.
From Canon USA (specs are for the newer Mark II series of the lens):
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.
Focal Length & Maximum Aperture 16-35mm f/2.8 Lens Construction 16 elements in 12 groups Diagonal Angle of View 108°10′-63° Focus Adjustment AF with full-time manual Closest Focusing Distance 0.92 ft./0.28m Filter Size 82mm, P=0.75mm/1 filter Max. Diameter x Length, Weight 3.5 in. x 4.4 in./88.5mm x 111.6mm, 640g