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+--- Thread: next PZ lens test report: Sigma AF 120-400mm f/4.5-5.6 HSM DG OS (/showthread.php?tid=3401)
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next PZ lens test report: Sigma AF 120-400mm f/4.5-5.6 HSM DG OS - backcountryskier - 02-06-2011
well that probably says something about the optical performance of the 50-500 OS, then.