Sigma 18-125 mm f/3.8-5.6 DC OS HSM review - Vignetting

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Sigma 18-125 mm f/3.8-5.6 DC OS HSM

4 September 2009

Arkadiusz Olech

8. Vignetting

In this category, traditionally Nikon zooms performed badly, being poor at ends of focal lengths and showing vignetting exceeding 40% at the widest angle, and 50% at the narrowest. Sony 16-105 mm at its widest angle also distinctly exceeded the level of 40%, but in its case the expectations were different, as is gives the largest angle of view.

Sigma 18-125 mm f/3.8-5.6 DC OS HSM - Vignetting

No matter how you look at it, Sigma performs the best here as well, although you need to remember that at the widest angle it has aperture slightly worse than the competitors. There, the light falloff in the corners of the frame amounts to 37% (-1.34 EV). When using f/5.6 aperture this value falls to 21%, to reach 15% at f/8.0 and go to an unnoticeable level of 11% at f/11.

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At 35 mm focal length and f/4.5 aperture the vignetting totals 28% (-0.95 EV). After stopping down to f/5.6 the value falls to 20% and, at f/8.0, to 9%.

At 70 mm the situation looks similarly. At maximum aperture the light falloff in the corners of the frame totals 27% (-0.91 EV), at f/8.0 falls to 11% and at f/11 equals only 4%.

We didn’t record any distinct increase of vignetting at the maximum focal length either. At it and at the maximum aperture the light falloff in the corners amounts to 26% (-0.87 EV), and additionally after stopping down by one value the aberration becomes nearly unnoticeable (11%).

Summarizing, here again we don’t have some excellent results, but in its parameters’ class Sigma is an appliance positively standing out compared to the competitors.