The Sigma 2.8/105 features a very interesting construction with the front element deeply hidden inside the barrel which, in this case, functions also as an additional hood. By the way a second hood is included in box but in this situation it seems unnecessary. The Sigma 2.8/105 damps down unwanted flares on its own very well as you can see it in the picture below. Most probably we should consider several factors responsible for such a good performance: a unique construction, a quite long focal length and efficient anti-reflection coatings.
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