Sigma S 500 mm f/5.6 DG DN OS
7. Coma, astigmatism and bokeh
| Center, f/5.6 | Corner APS-C, f/5.6 | Corner FF, f/5.6 |
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| Center, f/8.0 | Corner APS-C, f/8.0 | Corner FF, f/8.0 |
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Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 4.1% and it is a value on the borderline between very low and low levels. In other words we get another category that can be considered an asset of the tested lens.
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When it comes to out-of-focus circles of light, they look really nice, with an even light spread inside, without any local extremes, and not especially bothersome brighter rim. Mechanical vignetting is the only feature you should have any objections about. It remains visible even on stopping down the aperture by 2 EV.
| Center, f/5.6 | Corner APS-C, f/5.6 | Corner FF, f/5.6 |
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| Center, f/8.0 | Corner APS-C, f/8.0 | Corner FF, f/8.0 |
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Center, f/11.0 | Corner APS-C, f/11.0 | Corner FF, f/11.0 |
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