Sigma A 35 mm f/1.4 DG II
7. Coma, astigmatism and bokeh
| Center, f/1.4 | Corner APS-C, f/1.4 | Corner FF, f/1.4 |
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| Center, f/2.0 | Corner APS-C, f/2.0 | Corner FF, f/2.0 |
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To make our testing more comprehensive, we decided to show crops taken from photos of night sky taken from the right-hand upper corner of full frame. This time we show images taken by f/1.4, f/2.0, and f/2.8 - in this case coma is similar to the results of the diode test.
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| Corner FF, f/1.4 | Corner FF, f/2.0 | Corner FF, f/2.8 |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 values, amounted to 4.1%. It's a value on the borderline between very low and low level, which shouldn't worry you. In this category the Sigma fares noticeably better than the Samyang and the Nikkor but is defeated by the more expensive Sony.
Out of focus images are nice. The light spread in the circles seems to be quite even, onion-ring bokeh, despite aspherical elements inside, isn't especially bothersome. A brighter rim that appears on more significant stopping down, is not intensive. Mechanical vignetting is distinct both by f/1.4 and by f/2.0. Even by f/2.8 it doesn't disappear completely and in this aspect the Sigma fares the weakest out of four 1.4/35 models, presented here.
| Center, f/1.4 | Corner APS-C, f/1.4 | Corner FF, f/1.4 |
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| Center, f/2.0 | Corner APS-C, f/2.0 | Corner FF, f/2.0 |
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Center, f/2.8 | Corner APS-C, f/2.8 | Corner FF, f/2.8 |
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