Ideal for travel, mid-range nature/wildlife and general photography, the Canon EF-S 17-85mm f/4-5.6 IS USM is a lightweight, compact all-purpose "standard" zoom lens. Equivalent to a 28-135mm lens in 35mm format, this EF-S lens brings 5x wide-angle to tele coverage to EOS 20D and Digital Rebel shooters. This lens features Canon's latest optical Image Stabilizer technology, providing up to 3-stop compensation for image blur caused by camera shake and slow shutter speeds. The lens has a 17 element, 12 group construction, including one double-sided aspherical element for crisp, high contrast corner-to-corner detail. A ring-type USM means both fast and silent AF, as well as full-time manual focus when in the AF mode.