The EF 75-300mm f / 4-5.6 III zoom lens covers many commonly used telephoto focal lengths and delivers great image quality. The lens is an affordable and compact partner for any EOS camera. This 4x zoom telephoto lens is ideal for the financially conscious photographer who is interested in shooting sports, outdoor life or portraits. Like other telephoto lenses, the EF 75-300mm f / 4-5.6 III compresses perspective, allowing the photographer to limit depth of field. The integrated AF motor provides fast autofocus. The electromagnetic diaphragm of the lens ensures extremely precise control of the aperture setting.