Nikon Df with Nikkor 24-120mm f/3.5-5.6D never locks focus - help?

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24hrexposure
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Nikon Df with Nikkor 24-120mm f/3.5-5.6D never locks focus - help?
4 months ago

I have a new Nikon Df and I'm having a lot of trouble with my old 24-120 lens. This is the pre-2003 version. In ideal conditions (outside on a sunny day shooting a high-contrast scene) it never locks focus at the long end of the range (80-120 mm). It just hunts back and forth forever. Manual focus and live-view focus both work fine, so it seems like an issue with the phase detect AF system. Has anyone experienced an issue like this or know what the problem might be?

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