Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical (IF) Macro Ultra Zoom Lens for Canon Digital SLR Cameras (Model A061E) World's smallest and lightest 28-300mm lens (June 2004) 28-300mm focal length f/3.5-6.3 maximum aperture XR (Extra Refractive Index) glass Multipurpose lens for Canon 35mm film and digital SLRs; macro to telephoto ranges