Sigma 150 mm f/2.8 EX DG HSM APO Macro review - Vignetting

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Sigma 150 mm f/2.8 EX DG HSM APO Macro

16 April 2010

Arkadiusz Olech

8. Vignetting

We can feel a tiny bit dissatisfied observing how the lens fares at the maximum aperture. The light fall-off there amounts to 20% (-0.65 aperture value) which is perhaps not very bothersome on a small APS-C sensor but might become so on full frame.

Fortunately by f/4.0 the level of this aberration decreases to 9% and we consider it to be imperceptible.

Sigma 150 mm f/2.8 EX DG HSM APO Macro - Vignetting

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Our attentive readers noticed that in the case of many Sigma lenses you can observe an interesting narrowing of brightness contours at the bottom of the frame. The Sigma 2.8/150 is not an exception here as it can be seen in the pictures below. We chose deliberately two pictures between which the camera-and-lens set was turned by 90 degrees. As you see neither the numeric result nor the contours’ shape changed and it makes us think that this strange behaviour is connected with the camera-and-lens set, not with a measurement error caused by e.g. uneven lighting of the test chart.

We think it worth emphasizing, though, that this problem is just a curiosity, not a serious flaw of a kind. This effect, although visible in measurements, won’t influence the quality of our pictures and you won’t notice it practically at all in real photographs.