Sigma C 100-400 mm f/5-6.3 DG OS HSM
7. Coma, astigmatism and bokeh
| Center, 100 mm, f/5.0 | Corner APS-C, 100 mm, f/5.0 | Corner FF, 100 mm, f/5.0 |
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| Center, 200 mm, f/5.6 | Corner APS-C, 200 mm, f/5.6 | Corner FF, 200 mm, f/5.6 |
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| Center, 300 mm, f/6.3 | Corner APS-C, 300 mm, f/6.3 | Corner FF, 300 mm, f/6.3 |
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| Center, 400 mm, f/6.3 | Corner APS-C, 400 mm, f/6.3 | Corner FF, 400 mm, f/6.3 |
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The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values amounted to just 2.6%. It is a very low value so the performance of the lens in this category should be assessed very highly. Officially it’s a lower result than that of both brand name rivals even though the difference between the Sigma and the Nikkor fits the margin of error.
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Below you see images of defocused light circles at 200 and 400 mm. Apart from a noticeable rim on the edge there is nothing that should make you worried. Blur areas provided by the Sigma should be pleasing to the eye – not bad for a zoom lens.
| Center, 200 mm, f/5.6 | Corner APS-C, 200 mm, f/5.6 | Corner FF, 200 mm, f/5.6 |
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| Center, 200 mm, f/8.0 | Corner APS-C, 200 mm, f/8.0 | Corner FF, 200 mm, f/8.0 |
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Center, 200 mm, f/11.0 | Corner APS-C, 200 mm, f/11.0 | Corner FF, 200 mm, f/11.0 |
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| Center, 400 mm, f/6.3 | Corner APS-C, 400 mm, f/6.3 | Corner FF, 400 mm, f/6.3 |
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| Center, 400 mm, f/9.0 | Corner APS-C, 400 mm, f/9.0 | Corner FF, 400 mm, f/9.0 |
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Center, 400 mm, f/13.0 | Corner APS-C, 400 mm, f/13.0 | Corner FF, 400 mm, f/13.0 |
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