Canon EF-S 18-55mm f/3.5-5.6 USM SLR Lens for Select Digital Rebel and EOS SLRs EF-S mount for Digital Rebel, EOS 20D, EOS 30D, Digital Rebel XT and Digital Rebel XTi with shorter back focus than ordinary EF lenses Compact, lightweight design 18-55mm focal length f/3.5-5.6 maximum aperture Micro UltraSonic Motor (USM)