As stated above, Do NOT Mount either lens or the TC on your D7000! Any lens made before 1977 will be Pre-AI and can Not be mounted on your D7000 without being modified to AI spec. While I suspect David White would convert them, it wouldn't be worth it. Given that the 70-300mm is f/5.6 adding a 2X TC will get you to f/11 which means the viewfinder will be very dark making focusing very difficult even in bright daylight and impossible in poor light. Good Luck and Enjoy your Nikons!