Average Reviews:
(More customer reviews)I use this converter on my Sigma 70-200 f/2.8 HSM Nikon mount. I used it first last fall at the Petit Le Mans at Road Atlanta and was very impressed with the results. Aperture is reduced to f/4, which is still a bright finder, and autofocus operation is not negatively effected. All electronic functions such as HSM and D coupling still work. Very sharp from my experience.
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Sigma's 1.4X APO teleconverter lens features gives you a high-performance optical design with five elements in three groups. It is optimized for use with long telephoto and telezoom lenses, and is ideally suited for use with the 70-200mm f2.8 APO EX HSM zoom lens. Using 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 Nikon AF SLR cameras.
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