BlattWorld, Item Details: Sigma 2x APO EX Teleconverter

The new dedicated 2x APO Teleconverter features a 6 element/5 group optical design, and it is specifically designed for use with longer telephoto and telezoom lenses. The high performance optical characteristics of this teleconverter maintains the optica

l performance of the compatible lenses with which they can be used. Using 10-pin electrical interfaces, there is no loss of autofocusing speed when this teleconverter is used with compatible H.S.M. type lenses for Canon, Sigma, and now Nikon AF cameras

(except N50/F50 models). They are ideally suited for use with the 1.4x F2.8 APO EX HSM zoom lens; providing normal exposure and autofocus function, while maintaining its high optical performance