The FUJINON XF100-400mm F4.5-5.6 R LM OIS WR is a telephoto zoom lens. The high-performance optical construction of 21 elements in 14 groups includes five ED lenses and one Super ED lens to help reduce chromatic aberration that often occurs in telephoto lenses. As a result, it delivers high image quality in its class. The lens has been designed for handheld shooting with a 5.0-stop image stabilization system. Linear motor for fast autofocusing makes it perfect for shooting fast-moving subjects including aircraft and motorsports. The lens is also both water and dust resistant and can operate in low temperatures, so it's suitable for use in a wide range of outdoor shooting conditions. A fluorine coating has also been applied to the front lens element to repel water and dirt, further improving the toughness of the lens.