Sigma 50 mm f/1.4 EX DG HSM
8. Vignetting

On stopping down to f/2.0 the vignetting doesn’t bother us almost completely (12%) and by f/2.8 it disappears (8%).
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The fact of the existence of a very interesting non-central vignetting profile, presented by the Sigma, should be noticed here. To make sure that it’s not a result of an error or a body defect we repeated the vignetting test on another camera with the APS-C sensor and the results, within the error margin, were the same and the non-central profile also visible very clearly.
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