Sigma A 24 mm f/1.4 DG HSM
7. Coma, astigmatism and bokeh
In order to defend the Sigma a little you can say the Canon and the Nikkor in this category had equally pathetic results; the Samyang was definitely the best of all 1.4/24 class lenses although also in its case the coma correction still couldn’t be called good.
| Center, f/1.4 | Corner APS-C, f/1.4 | Corner FF, f/1.4 |
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| Center, f/2.0 | Corner APS-C, f/2.0 | Corner FF, f/2.0 |
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The astigmatism, understood as an average difference between horizontal and vertical MTF50 values the Sigma manages much better than the coma. The value of that aberration measured by us amounted to 7% - it is the same result as that of the Nikkor 1.4/24G but noticeably higher than that of the Canon 1.4/24L which astigmatism level was just 2%.
It would be difficult to complain about the appearance of defocused light points. The light spread inside them is very even, without any noticeable local extremes. Still there are two things worth emphasizing. Firstly, the circles in the full frame corners by f/1.4 and f/2.0 are truncated which is a symptom of significant mechanical vignetting. Secondly, the exaggerations stemming from the wide angle of view make the images longer; as a result some photos with many lights in the blurry areas might seem less pleasing to the eye.
| Center, f/1.4 | Corner APS-C, f/1.4 | Corner FF, f/1.4 |
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| Center, f/2.0 | Corner APS-C, f/2.0 | Corner FF, f/2.0 |
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Center, f/2.8 | Corner APS-C, f/2.8 | Corner FF, f/2.8 |
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