 "Canon EF wide-angle lens - 20 mm" " Canon mm 2509A003 Camera & Camcorder Lenses CDW.com
"This ultra-wide-angle lens is ideal for serious applications. It is easy to hold and carry at 14.3 oz. (405g). It features floating rear focusing system. Sharp images are obtained at all subject distances." 
 "Canon EF-S 10-22mm f/3.5-4.5 USM Lens"@en "Camera Lenses :: Canon Lens - Onestop Digital"@en
"This exciting new 10-22 mm zoom lens provides ultra wide-angle coverage to the EOS 20D and Digital Rebel shooter. Equivalent to a 16-35mm zoom it offers excellent performance and optics designed from the ground-up for digital SLR use. Three Aspherical lens elements plus a Super-UD element assure image quality. Its ring-type USM means fast and silent AF along with full-time manual focus. It focuses as close as 9.5 inches."@en 