Sirui Aurora 35 mm f/1.4
8. 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 1.3%, an excellent result that allows the Sirui to win in this category. Of course we must mention the fact that the result of the more expensive Sony is, within the margin of error, practically the same.
Out of focus images look nice. The light spread in the circles is perhaps not completely even, and you can notice onion-ring bokeh without any problems. A brighter rim that appears on more significant stopping down, is not intensive, but its distribution is rather asymmetrical for circles we got outside the frame centre. Here most of direct rivals fare better, with the exception of the Samyang.
Mechanical vignetting can be noticed both by f/1.4 and by f/2.0; even by f/2.8 it doesn't disappear completely.
| 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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