Please read carefully the questions, answers and reviews on Amazon for this must-have Sigma 200-500mm f/2.8 APO EX DG Ultra-Telephoto Zoom Lens for Nikon and Sigma DSLR Cameras (unfortunately for Canon and other brands' DSLR owners)
A riot
https://www.amazon.com/gp/product/B...17145&creative=399373&creativeASIN=B0013DAPNU
A riot
https://www.amazon.com/gp/product/B...17145&creative=399373&creativeASIN=B0013DAPNU