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Originally Posted by mik
Just bought a Sigma 100-300 as an upgrade from the Sigma70-300. The lens works fine on the D70 but refuses to Auto focus when I use the Kenko Pro300 1.4x teleconverter. Using the Kenko with the 70-300 is no problem.
So have I bought a lemon or is there a mod that I can do to get the 100-300 working with the kenco.
Any help with this issue would be much appreciated.
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Which 100-300 lens is it? Have you gone for the one with the constant f4?