Sigma A 24-70 mm f/2.8 DG DN
7. Coma, astigmatism and bokeh
| Center, 24 mm, f/2.8 | Corner APS-C, 24 mm, f/2.8 | Corner FF, 24 mm, f/2.8 |
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| Center, 45 mm, f/2.8 | Corner APS-C, 45 mm, f/2.8 | Corner FF, 45 mm, f/2.8 |
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| 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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Astigmatism, understood an an average difference between vertical and horizontal MTF50 function values, amounted to 3.9% and it is a low level. The reflex camera Sigma A 24-70 mm f/2.8 DG HSM fared weaker in this category as in its case we got a result of 12.7%. The tested Sigma also performs better than the rival Tamron in this category.
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Defocused cricles of light aren't perfect – you can have reservations concerning slight onion-ring bokeh visible inside the circles which, most probably, stems from using as many as three aspherical elements. Also a lighter rim makes itself felt and its intensity increases with stopping down the aperture. It would be difficult to miss the influence of mechanical vignetting which, by f/2.8, cuts out almost half of the circle. In the next chapter such a performance will be keenly felt for sure.
| 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, 70 mm, f/4.0 | Corner APS-C, 70 mm, f/4.0 | Corner FF, 70 mm, f/4.0 |
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Center, 70 mm, f/5.6 | Corner APS-C, 70 mm, f/5.6 | Corner FF, 70 mm, f/5.6 |
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