Sigma APO for Canon EOS 1.4x (823101) Lens Converter

Sigmas 1.4X APO teleconverter lens features gives you a high-performance optical design with five elements in three groups. It is optimized for use with long telephoto and telezoom lenses, and is ideally suited for use with the 70-200mm F2.8 APO EX HSM zoom lens. Using 10-pin electrical interfaces, there is no loss of autofocusing speed when these teleconverters are used with compatible HSM type lenses. This model is dedicated to Canon AF SLR cameras.