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Sigma 2.0X APO Tele Converter for Pentax-AF Camera

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Amazon.com Product Description 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.