BlattWorld, Item Details: Sigma 1.4x APO EX Teleconverter

The new 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 this teleconverter maintains the o

ptical 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 ca

meras (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.