Sigma 19 mm f/2.8 EX DN review - Vignetting

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Sigma 19 mm f/2.8 EX DN

15 May 2012

Arkadiusz Olech

8. Vignetting

When it comes to the vignetting, let’s check first how the lens fares on the smaller Micro 4/3 sensor.

At the maximum relative aperture the vignetting is distinct although not especially high, amounting to 28% (-0.94 EV). To tell you the truth, I thought it would be higher seeing those small elements of the Sigma. The fact that stopping down the aperture has very slight influence on that aberration is a problem though. By f/4.0 the vignetting reaches the value of 21% (-0.69 EV) and by f/5.6 it is 15% (-0.48 EV). On further stopping down you can’t observe any measurable influence on the level of this aberration

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Let’s glance now at the vignetting results on the APS-C sensor.

Compared to the smaller Micro 4/3 sensor the increase of this aberration is obvious. At the maximum relative aperture the light fall-off in the frame corners amounts to as much as 41% (-1.51 EV). On stopping down the lens to f/4.0 this aberration is still significant and gets to 37% (-1.32 EV). Using the f/5.6 aperture you can make the vignetting decrease to 29% (-1.00 EV). It is still visible even by f/8.0 and f/11, where it reaches the value of 24% (-0.81 EV).