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Bought one of these to go with a 300mm F4 AF lens. When I mounted the two on my D600 and my D7000, the AF does not work. The lens itself works fine on both cameras. Nikon told me the 300mm with the TC was for FX only! I also noted that the TC has a slight rattle to it when gently shaken. Anyone have any advice. The TC is new and I want to know whether to send it back.
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