A big front element, almost not hidden inside the casing at all, and as many as 19 elements positioned in 14 groups (so 28 air-to-glass surfaces) is a very difficult situation when it comes to the lens’s performance against bright light. I admit we anticipated huge problems in this category; however, contrary to the vignetting, the reality proved to be better than our predictions. Of course you can notice some flares but they are neither so common nor so numerous as we expected. The Sigma’s 24-105 mm OS work against bright light we assess as moderately good and we have no serious reservations here.
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