When it comes to the performance against bright light our expectations were limited indeed. The task before optics and mechanics constructors of the Sigma was very difficult. Firstly, you deal here with a very big front element not sheltered by anything. Secondly, you get an optical system with as many as 25 elements in 19 groups which in practice means as many as 38 air-to-glass surfaces where light can be reflected. Thirdly, the 10x zoom needs a lot of space for element movement so the constructors are limited when it comes to special apertures which can reduce effects connected to unwanted flares.
All these factors make us say that it’s better to keep the Sigma S 60-600 mm far from sources of strong, bright light because if you don’t distinct artefacts and contrast loss are practically guaranteed. Respectively we can’t assess the performance in this category as good or even average. Such lenses as the Sigma S 150-600 mm or the Nikkor 200-500 mm, even if they didn’t impress with their results in this category, still managed to perform better. Of course you have to remember none of them featured such a wide focal range and so complex optics inside.
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