Sigma C 18-200 mm f/3.5-6.3 DC Macro OS HSM review - Vignetting

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Sigma C 18-200 mm f/3.5-6.3 DC Macro OS HSM

27 June 2014

Arkadiusz Olech

8. Vignetting

Let’s glance at thumbnails, presented below, to check how the Sigma C18–200 mm OS corrects the vignetting while attached to the Canon 50D.

Sigma C 18-200 mm f/3.5-6.3 DC Macro OS HSM - Vignetting

At the wide angle and the maximum relative aperture the aberration is quite significant, reaching 37% (-1.34 EV). On stopping down the aperture to f/4.0 you see its level decrease to 29% (-1.00 EV). Employing f/5.6 makes the vignetting go down to 20% (-0.66 EV). Further stopping down influences that aberration very slightly.

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Less problems you can experience at 50 mm focal length where, at the maximum relative aperture, the vignetting reaches 28% (-0.94 EV) and it decreases to 20% (-0.66 EV) on stopping down the aperture to f/5.6. The aberration becomes almost imperceptible by f/8 and f/11 amounting respectively to 13% (−0.39 EV) and 9% (−0.29 EV).

Similar results we got at 100 mm focal length. At the maximum relative aperture the brightness loss in the frame corners was 30% (-1.04 EV) and it decreased to 16% (-0.52 EV) for f/8.0. By f/11 that aberration becomes imperceptible amounting to just 10% (-0.31 EV).

At the maximum focal length the vignetting increases again and by f/6.3 it reaches 33% (-1.17 EV). On stopping down the lens to f/8.0 you get a result of 21% (-0.67 EV) and by f/11 it is just 12% (-0.38 EV).

The results, described above, might seem not especially impressing but you should remember that the predecessor of the tested lens could have the vignetting level exceeding 50% and the rival Canon 18-200 mm IS went over 40% on both ends. Compared to that the results of the Sigma look really good. It is also worth adding that the Nikkor 18-200 mm VR showed values similar to those of the Sigma and the Tamron 18-200 mm fared even a bit better, with really impressive performance at the maximum focal length.