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 to conserve 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. ? Rubber O-ring can be combined with EOS 1V and EF II teleconverters for near imperviousness to moisture exposure ? Two-stage Image Stabilization can correct for all types of camera shake or just up/down shake (for use when panning with a moving subject) ? Focus limiter switch ? Shorter minimum focusing distance and higher maximum magnification than its 70-200mm f/2.8 L predecessor