Brendo, have you looked at the Sigma 120-400 OS, I used one on my D7000 and it performed well.
Regards John Nikon D750, Sigma 105mm OS Macro, Tokina 16-28 F2.8, Sigma 24-105 Art, Sigma 150-600C, Benro Tripod and Monopod with Arca plates
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