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Near the maximum relative aperture the work against bright light is very satisfying. After a significant stopping down, though, the problems start to appear. They are not especially pronounced for the smaller sensor of the Canon 50D but on full frame you can observe more distinct artifacts. It would be difficult to ignore them and you can catch them even if the sun is outside the frame.
In this category the Sigma doesn’t compare as favourably with its competitors as in the other categories. It performs a bit better than the Zeiss and like the Sony but it is worse than the Nikkor, the Canon and the Samyang.
