Description of Sigma 2X APO EX DG Canon Fit:
Sigma 2X EX DG APO AF TeleConverter features a high performance 5 element/3 group optical design, and is optimized for use with long telephoto and telezoom lenses. The high performance optical characteristics of the Sigma 2X EX DG AF TeleConverter maintain the optical performance of the compatible lenses with which they can be used.
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