Sigma A 12-24 mm f/4 DG HSM
7. Coma, astigmatism and bokeh
| Center, 12 mm, f/4.0 | Corner APS-C, 12 mm, f/4.0 | Corner FF, 12 mm, f/4.0 |
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| Center, 18 mm, f/4.0 | Corner APS-C, 18 mm, f/4.0 | Corner FF, 18 mm, f/4.0 |
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| Center, 24 mm, f/4.0 | Corner APS-C, 24 mm, f/4.0 | Corner FF, 24 mm, f/4.0 |
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When it comes to the astigmatism understood as an average difference between horizontal and vertical MTF50 function values, it amounted to 3.2%. The results below 5% we consider to be low so it seems the Sigma 12-24 mm corrects that off-axis aberration very well; anyway its result is a tad better than the result of the more expensive Canon 11-24 mm.
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With such a focal range and aperture values it is very difficult to get big out-of-focus areas in photos so appraising the lens in this category is a bit art for art’s sake. Still it’s worth noticing that defocused circles of light look sensible; their only flaw is a lighter rim. What’s important, there are no traces of distinct mechanical vignetting.
| Center, 24 mm, f/4.0 | Corner APS-C, 24 mm, f/4.0 | Corner FF, 24 mm, f/4.0 |
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| Center, 24 mm, f/5.6 | Corner APS-C, 24 mm, f/5.6 | Corner FF, 24 mm, f/5.6 |
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Center, 24 mm, f/8.0 | Corner APS-C, 24 mm, f/8.0 | Corner FF, 24 mm, f/8.0 |
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