Tamron AF 18-250mm F/3.5-6.3 Di-II LD Aspherical (IF) Macro Zoom Lens for Canon Digital SLR Cameras (Model A18) 18-250mm zoom lens with f/3.5-6.3 maximum aperture for Canon digital SLR cameras Offers telephoto capabilities of 28-388mm (35mm equivalent) in a single compact housing Low-dispersion (LD) glass eliminates chromatic aberration and sharpens ultra-long shots Maximum magnification ratio of 1:3.5 for macro shots; minimizes ghosting and flare Measures 2.9 inches in diameter and 3.3 inches long; weighs 15.2 ounces