Sigma S 70-200 mm f/2.8 DG DN OS
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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Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 9.6%, a value on the borderline between low and medium levels. Once again no serious reservations about this result.
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The appearance of defocused circles of light is sensible. Taking into account the fact that you deal here with a zoom lens. There are traces of onion-ring bokeh but they are really slight (after all the optical system of this lens does feature aspherical elements) and you can barely spot a brighter rim on the edge. Mechanical vignetting, though, can bother you a bit, very distinct by f/2.8, quite noticeable by f/4.0, and still visible by f/5.6. The same effect we observed while testing the more expensive Sony model though.
| 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, 200 mm, f/4.0 | Corner APS-C, 200 mm, f/4.0 | Corner FF, 200 mm, f/4.0 |
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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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