Viltrox AF 35 mm f/1.8 EVO
7. Coma, astigmatism and bokeh
| Center, f/1.8 | Corner APS-C, f/1.8 | Corner FF, f/1.8 |
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| Center, f/2.5 | Corner APS-C, f/2.5 | Corner FF, f/2.5 |
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To make our test more interesting and comprehensive, we decided to show photos of night sky taken from the right-hand upper corner of a full frame by f/1.8, f/2.5, and f/3.5. In this case, coma levels are very similar to the previous photos of a diode.
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| Corner FF, f/1.8 | Corner FF, f/2.5 | Corner FF, f/3.5 |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to just 6%, a value we consider to be on the borderline between very low and low level.
The appearance of defocused circles of light, provided by the Viltrox 1.8/35 EVO, is quite nice. Its optical construction features one aspherical element so the effect of onion-ring bokeh remains visible but not especially intense. The interiors of the circles feature a quite even light spread and the outer rim is moderately bright.
Mechanical vignetting is bothersome at f/1.8 and f/2.5, but on stopping down the aperture by 2 EV it disappears completely.
| Center, f/1.8 | Corner APS-C, f/1.8 | Corner FF, f/1.8 |
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| Center, f/2.5 | Corner APS-C, f/2.5 | Corner FF, f/2.5 |
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Center, f/3.5 | Corner APS-C, f/3.5 | Corner FF, f/3.5 |
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