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"RE: Nikon 500mm f/4 AFS II on D600 with Nikon 1.4X II HELP"
An f/4 lens with a TC-14 has a maximum aperture of f/5.6, not "over f/5.6". I don't think this is the problem here, especially since we've been told that the lens with TC focuses successfullly on other camera bodies.