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I have the Sigma 50-500 OS version. It requires good light and a good, sensitive AF camera system. Works well with good light & a good camera. It's not a Nikon 500 f4, but considering the cost is a very good value. Only real complaint is the lens hood doesn't fit well, Sigma needs to do a better job here. i have the Nikon 70-200 VR1 also and would say the Bigma IQ is slightly better than 70-200 VR1 with TC1.7 at same FL.