Reviews and Problems with Sigma APO 135-400mm F4.5-5.6 DG
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Value for money 6
Overall quality 5
Build quality 6
Sigma AF 135-400mm f/4.5-5.6 APO Aspherical RF - Review / Test Report
5 April 2006
Conclusion: The Sigma AF 135-400mm f/4.5-5.6 APO Aspherical RF is not a perfect lens nor can you expect that a budget lens reaches high end quality levels. Nonetheless it is capable to provide very decent results especially in the 135-300mm range.