Sigma 85 mm f/1.4 EX DG HSM
7. Coma and astigmatism
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In fast lenses with the focal lengths ranging from 50 to 100 mm the coma is the most frequent problem. The Sigma, tested here, didn’t manage to avoid it either. On the edge of the APS-C/DX sensor the coma is slight but noticeable by f/1.4 and by f/2.0 too. In the full frame corner the coma becomes huge. Here the Sigma fares worse than the Zeiss 1.4/85 and the Nikkor AF-S 1.4/85 but a tad better than the Canon 1.2/85. What’s interesting among the all 85 mm class lenses the coma is corrected the best by the cheapest Samyang.
The astigmatism of the tested lens is low and not bothersome at all because its average value amounted to 5%. No reasons to worry here.
