Compare Sigma EX APO 1.4x (823-306) Lens Converter for Nikon AF to Sigma (875109) (2x) Lens Converter

The dedicated 1.4x APO Teleconverter features a high performance 5 element/3 group optical design, and it is optimized for use with long telephoto and telezoom lenses. The high performance optical characteristics of these teleconverters maintain the optical performance of the compatible lenses with which they can be used. Using 10-pin electrical interfaces, there is no loss of autofocusing speed when these teleconverters are used with compatible H.S.M. type lenses for Canon, Sigma, and now current Nikon AF cameras (except N60/F60 models). They are ideally suited for use with the 70-200mm F2.8 APO EX HSM zoom lens; providing normal exposure and autofocus function, while maintaining its high optical performance. Less

The Sigma 2.0x APO teleconverter lens features a high-performance optical design with five elements in three groups. It is optimized for use with longer telephoto and telezoom lenses, and is ideally suited for use with the 70-200mm f2.8 APO EX HSM zoom lens. This lens provides both normal exposure and autofocus function, while maintaining its high optical performance. Since it uses 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 Pentax AF SLR cameras. Less