Tamron 70-200 vs.Sigma 70-200

Na dpreview najdes recenzie oboch
http://www.dpreview.com/lensreviews/tamron_70-200_2p8_c16/
http://www.dpreview.com/lensreviews/sigma_70-200_2p8_n15/

Tu je zaver zhodnotenia zo sigmy:
Overall, if you appreciate the limitations of this lens and stick within its practical limits, it provides much of the performance of the camera manufacturers´ equivalents at a much lower price. Potential buyers will also inevitably compare it to the Tamron SP AF 70-200mm 1:2.8 Di LD (IF) Macro, and here the choice essentially boils down to the superior optics of the Tamron versus the Sigma´s excellent autofocus system. Indeed ultimately that hypersonic motor is the Sigma´s strongest selling point, so if you´re looking for a budget fast telezoom for low light or action work, then this is the lens for you.