Lens review

Sigma 70 mm f/2.8 EX DG Macro

9. Ghosting, flares and transmission

How the Sigma 2.8/70 works against bright light? Its performance is also outstanding. Only when the Sun is positioned in one frame corner you can see a trace of a flare in the other one. It is shown in the photo below.

Such good results are undoubtedly due to great anti-reflection coatings; their quality can be assessed when you consult a transmission graph, presented below.

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Taking into account the fact that the producer had to cover as many as 18 air-to-glass surfaces these results can be considered sensational. In the blue and red part of the spectrum we get the values on the level of 95-97% and even a slight dip in the middle of the range, where the transmission descends to 93%, is not able to spoil the overall great performance.