The pinnacle in Canon's constant-aperture telephoto zoom lenses, the 70-200mm f/2.8 L "IS" lens is an incredible optic with robust design and tacksharp results. Second-generation Image Stabilization responds in as little as 0.5 seconds, while providing stabilization that is three times as handholdable as a normal lens. IS now automatically deactivates when on a tripod by sensing non-movement of the camera and lens, also conserving battery power. An entirely new optical formula produces images that are superior to even its highly regarded predecessor, the 70-200mm f/2.8 L, despite having more reflective surfaces within the lens.
