f/2.8 aperture L series robust construction Image stabilisation The professional level Canon EF 300mm f/2.8L IS USM telephoto lens offers both the image stabilisation and a bright maximum aperture, making it capable of producing well exposed images at fast shutter speeds for sports and wildlife photography. Adding to the credentials for outdoor use is the weatherproof L series build, which the lens shares with the other Canon 300mm option, although here the aperture is brighter meaning improved low light and continuous shot performance is available. For a professional photographer with a fast burst rate full frame body, such as the EOS 1D Mark III, the Canon EF 300mm f/2.8L IS USM is an excellent telephoto lens. Having a bright aperture in a lens with such a long focal length is a massive advantage, as the lens can continue to function in reduced light or when faster shutter speeds are used. Shooting outdoors is aided by moisture and dust re