The Sigma 30mm DC DN f/1.4 Contemporary lens (along with the Sigma DC DN 16mm f1.4 & 56mm f1.4 Contemporary Prime lenses), is voted one of the sharpest lenses for the Sony E-mount interchangeable camera system by DXOmark.com. It is even sharper than the Sony E 35mm f/1.8 and the Carl Zeiss Touit 32mm f/1.8!
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