The Canon EF USM is a 70 - 200 mm f/2.8L telephoto zoom lens that enables you to shoot clear close-up photos. With a construction of 18 elements in 15 groups, this Canon camera lens effectively reduces aberrations in your photos. This 70-200 mm f/2.8L lens has a bright maximum aperture of f/2.8 that allows you to take brilliant shots even in low-lit conditions. Featuring a focal length of 70 - 200 mm, this Canon camera lens lets you create a feeling of depth in your photos. The Canon EF USM easily accommodates 77 mm filters that offer protection from dust and scratches.