Released concurrently with the EOS 5D, Canon's EF 70-300mm f/4-5.6 IS USM telephoto zoom lens replaces the 10-year-old EF 75-300mm f/4-5.6 IS USM lens. The new lens combines ultra-low dispersion (UD) and aspherical lens elements and includes an improved optical image stabiliser (IS) that allows users to shoot at approximately three shutter speed increments slower than a non-stabilised lens.