Viltrox AF 16 mm f/1.8
7. Coma, astigmatism and bokeh
In this category the bigger Viltrox has to admit its defeat in the duel with the more expensive Sony model that corrected coma noticeably better.
| 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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In order to make the situation clear and comprehensive we decided to present also crops from photos of the sky taken from the upper right-hand corner of full frame. This time we show shots by f/1.8, f/2.5, and f/3.5. In this case coma looks similar to the images we got during our diode tests. It's pretty obvious that only after stopping down the aperture to f/3.5 the 'wings' disappear completely but even then the star takes a shape of a short line.
| 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 vertical and horizontal MTF50 function values, amounted to 10.9%. It is a value positioned on the borderline between a low and medium level so it doesn't give you any reasons to worry.
Defocused circles of light generated by the Viltrox are not especially good. Their light spread is uneven, with a distinct onion ring structure stemming from using aspherical elements. Fortunately mechanical vignetting is not especially pronounced.
| 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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