Sigma 180 mm f/2.8 APO Macro EX DG OS HSM review - Vignetting

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Sigma 180 mm f/2.8 APO Macro EX DG OS HSM

2 November 2012

Arkadiusz Olech

8. Vignetting

Thumbnails below show that on the smaller APS-C/DX sensor the vignetting can be noticed only at the maximum relative aperture. The value of that aberration, measured by us there, amounted to 24% (-0.80 EV) – in our view still a moderate level. On stopping down to f/4.0 you see all the problems disappear because the vignetting decreases to a negligible value of 8% (-0.25 EV).

Sigma 180 mm f/2.8 APO Macro EX DG OS HSM - Vignetting

For obvious reasons there will be more problems on full frame; still it doesn’t mean these problems are exceptionally acute.

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At the maximum relative aperture the brightness loss in the frame corners is 36% (-1.30 EV). It is significant but you shouldn’t panic – on stopping down the situation improves very quickly. The vignetting decreases to 19% (-0.61 EV) if you use f/4.0 aperture and when you stop down further it reaches value which we deem to be imperceptible or just slightly bothersome. The official results we got by f/5.6 and f/8.0 are respectively: 13% (-0.40 EV) and 9% (-0.26 EV).