Mark Goldstein has just posted a full review of the newly announced Sigma 60-600mm F4.5-6.3 DG OS HSM Sports Lens (pre-order at Amazon/ B&H/ Adorama) at the PhotographyBlog. He tested this new lens on Canon EOS 5Ds R, and find it a unique lens that delivers… Read moreSigma 60-600mm F4.5-6.3 DG OS HSM Sports Review (PhotographyBlog)