One thing to remember.The D7000 is a 1.5 crop.My 80-400 is a 120-600 on the D7000.I also own a D3, it is a 1.0 crop, 80-400 is 80 to 400.You can still use your DX lens on an FX camera, you get a little vigneting in the shot.Also what size photo do you print? That matters as well.
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