Today’s launches in Las Vegas have the advantage of offering good opportunities to make interesting comparisons. First comes to my mind the opposition of two high-end tele-zooms that should interest the enthusiast photographer looking toward sports, wildlife and even portrait: Sigma APO 120-400mm f/4.5-5.6 DG OS HSM Sony 70-300mm f/4.5-5.6 G (SAL70300G) Tous les deux…
