Canon EF 4410B002 - Teleconverter Lens - Designed for Lens - 2x Magnification - 2.8in Diameter

High-quality construction. Improved anti-reflection materials inside the lens-barrel and a coating around the outer edges of the lens elements reduce flare. Construction is resistant to dust and water, helping to maintain images quality. Focal length extension for super-telephoto lenses. The Extender EF 2x III is specially designed to work in conjunction with L-series IS super-telephoto lenses, extending their focal length by a factor of 2x. The extenders design ensures there is no loss of lens performance or image quality. Improved communication between lens and camera. A built in microprocessor provides accurate transfer of data from between the lens and camera delivering an improved performance in AF and metering.