75-300mm telephoto zoom lens with f/4.5-5.6 maximum aperture for Canon SLR cameras. Micro ultra-sonic monitor (USM) makes autofocusing quicker and quieter than before. Improved zoom mechanism with silver on the front; 4.9-foot close focus distance. Ideal for shooting sports, portraits, and wildlife; lightweight frame weighs 16.8 ounces. Measures 2.8 inches in diameter and 4.8 inches long