Sigma S 70-200 mm f/2.8 DG OS HSM
7. Coma, astigmatism and bokeh
| Center, 70 mm, f/2.8 | Corner APS-C, 70 mm, f/2.8 | Corner FF, 70 mm, f/2.8 |
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| Center, 135 mm, f/2.8 | Corner APS-C, 135 mm, f/2.8 | Corner FF, 135 mm, f/2.8 |
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| Center, 200 mm, f/2.8 | Corner APS-C, 200 mm, f/2.8 | Corner FF, 200 mm, f/2.8 |
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| Center, 280 mm, f/4.0 | Corner APS-C, 280 mm, f/4.0 | Corner FF, 280 mm, f/4.0 |
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When it comes to astigmatism, an average difference between horizontal and vertical MTF50 function values amounted to 7.1%. It wasn't a perfect result but still you can call it good. After attaching the 1.4x teleconverter the performance becomes a tad weaker because astigmatism increases to 11.3%.
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The out-of-focus areas obtained by this lens should be praised - it's enough you glace at our sample shots and out-of-focus circles of light, presented below, seem to confirm that impression. The light spread is very even, without any noticeable local extreme points, with just slightly accented rim. The only thing that might make you worried is noticeable mechanical vignetting. In the corner of the full frame sensor the circle of light remains truncated even on stopping down the aperture to f/5.6. It doesn't look good.
| Center, 135 mm, f/2.8 | Corner APS-C, 135 mm, f/2.8 | Corner FF, 135 mm, f/2.8 |
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| Center, 135 mm, f/4.0 | Corner APS-C, 135 mm, f/4.0 | Corner FF, 135 mm, f/4.0 |
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Center, 135 mm, f/5.6 | Corner APS-C, 135 mm, f/5.6 | Corner FF, 135 mm, f/5.6 |
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