Sigma uses really good coatings in its lenses and we’ve had an opportunity to check it while testing the transmission of some of them. Here we didn’t manage to perform a transmission test but, taking into account the fact that we deal with the EX series and looking at the photos below, we suppose the coatings work very well. Despite the huge and practically fully exposed front element it is difficult to catch any flares. When the source of light is situated in the very corner of the frame or just outside it you can’t see any artifacts. We must move it a bit towards the centre to notice, from time to time, some delicate flares inside the frame. It doesn’t happen often and it is hardly bothersome so in this category the Sigma can be only praised, especially that its performance is better than that of the Nikkor, the Samyang and the Canon.
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