Canon EF-S 10-22mm f/3.5-4.5 USM Lens
The first ultra-wide angle zoom for Canon’s EF-S cameras. Gives a zoom range equal to a 16-35 on a full frame camera with surprisingly good image quality.
Misc. Wide Angle Lenses
Canon EF 16-35mm f/2.8L II USM Lens
A pro quality ultra-wide angle zoom that delivers reasonable image quality with a constant f/2.8 aperture. That said, the 2007 design is dated and more modern designs (e.g. EF 16-35mm f/4L IS USM and EF 16-35mm f/2.8L USM III) significantly out perform it.
Canon EF 16-35mm f/4L IS USM
A very solid ultra-wide angle zoom that delivers very good image quality with solid features including, a 4 stop IS unit and weather resistant construction (with a front filter).