Sigma 70 mm f/2.8 EX DG Macro
8. Vignetting
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For the owners of reflex cameras with APS-C/DX sensors the problem of light fall-off in the corners of the frame is negligible. You can find it only at the maximum relative aperture where it amounts to 16% (-0.50 aperture value). By f/4.0 it disappears completely, decreasing to 3%.
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