Tamron AF 28-75mm f/2.8 XR Di LD Aspherical (IF) Autofocus Lens for Canon DSLR + MORE - International Version (No Warranty) 28-75mm autofocus zoom lens with f/2.8 maximum aperture Minimum focusing distance of 13 inches; rotation-type zoom Smaller and lighter than most fast zoom lenses; weighs 18 ounces LD glass elements reduces various aberrations while minimizing the fall-off of light at the corners Features XR (extra refractive index) glass and efficient use of aspherical lenses