24-105mm standard zoom lens with f/4 maximum aperture for Canon EOS SLR cameras. 1 Super UD glass element and 3 aspherical lenses minimize chromatic aberration and distortion. Ring-type USM system delivers silent but quick autofocus (AF); full-time manual focus. Image Stabilizer technology steadies camera shake at up to 3 stops; weighs 23.6 ounces. Dust- and moisture-resistant; measures 3.3 inches in diameter and 4.2 inches long