Ohh, one more thought on this to consider.. this is just from my experience on this okay.. personally, I think the Tamron 150-600mm lens is (works) better for higher resolution cameras than the Sigma 150-600mm Contemporary.. I know many who uses their Tammy on their D800 & D810 cameras (36mp), and the results are good.. again, this is just from my own experiences only.. when used my Sigma C on a D3100 (14mp) camera, it worked good, images are good.. when used on a D3300 (24mp) camera, the images was a bit soft and not as sharp (tried on both D3200 & D3300 bodies, both 24mp's, same results for me).. I used the lens on a D500 camera (20mp), and the results are good.. so now my Sigma C is permanently attached to the D500 camera, lol's.. just some thoughts to share..