The Canon EF 2x III Lens Extender increases the focal length of your lens without compromising on image quality.Compatible with Canon L-series telephoto or telephoto zoom lenses, this Lens Extender increases the focal length by a factor of 2x.Thanks to a built-in microprocessor, the EF 2x III Lens Extender offers accurate data transfer between the lens and camera for higher AF accuracy and metering.This Lens Extender features a high quality construction with improved anti-reflection materials inside the lens-barrel and a coating around the outer edges of the lens elements to help reduce flare. Resistant to dust and water, its ideal for use with weather sealed lenses.The Canon EF 2x III Lens Extender is ideal for press, sports and nature photography, helping you get closer to your subject.