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 the highest image quality in its class. The lens has been designed for handheld shooting with a 5.0-stop* image stabilisation system and weighs less than 1.4kg. The linear motor realises fast autofocusing and 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 temperatures as low as -10°C, so it is 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. This lens is in good overall condition with some signs of use. The glass is clean and in good condition. The lens barrel shows some cosmetic marks. There is some dust within the internal elements of the lens. The focus ring is in good condition. The lens mount shows signs of use. The tripod collar is in good overall condition with some cosmetic signs of use. The lens hood is in good overall condition with some cosmetic signs of use.There are light marks on the front element. These do not appear to affect the quality of the image.Please Note: There are some light fibres present within the lenses internal optics. They do not appear to affect the image rendered.