Reviews and Problems with Sigma 20mm F1.8 EX DG ASPHERICAL RF
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Value for money 8
Overall quality 3
Build quality 7
Sigma AF 20mm f/1.8 EX - Review / Test Report
31 January 2008
Conclusion: Due to its ultra-large max. aperture the Sigma AF 20mm f/1.8 EX is very ambitious lens. In theory you may argue that lens may be used for low light photography but its performance at max. aperture isn't really good enough for this.