This exciting telephoto lens provides extremist camera lens coverage to the Eos 20D, 30D, 40D, 50D and Digital Rebel SLRs. cherish a 16-35mm zoom, it offers glorious performance and optics designed from the ground-up for digital SLR use. 3 rounded lens components, and a Super-UD component, assure image quality. Its ring-type USM means that quickand silent AF together with full-time manual focus. It focuses as shut as nine.5 inches.