Sigma 50 mm f/1.4 EX DG HSM
7. Coma and astigmatism
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Coma may be a serious problem for fast 50 mm class lenses. It’s enough to have a look at the Sigma’s competitors’ results to be very surprised in some cases. In this light the Sigma results please us very much. Its coma is the smallest but it doesn’t mean it is imperceptible. The praise is certainly due, though.
When it comes to astigmatism, the result of the Sigma – 6.5% - is rather typical among the instruments of this class. Other 1.4/50 lenses had this aberration on the level from 4.5 to 7% so on the good and very good borderline.
