Viltrox AF 50 mm f/1.8 FE / Z
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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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 4.6%. It is a borderline between low and very low level so in this category the lens deserves a very high note.
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When it comes to out-of-focus areas we haven't seen such a beautiful disaster for a very long time. We also haven't seen a more nasty onion-ring bokeh – it's a kind of record in the history of our tests. Of course you should remember that structure stemms from aspherical elements. In order to avoid it the accuracy of their surfaces should be on a level of 0.01 micron or better. Nowadays few companies manage such a trick but it has to be said that Viltrox failed rather spectacularly in this aspect. If you can't produce good aspherical elements you should abstain from using them altogether. Such structures on the surface of elements can adversely affect not only bokeh but also image quality and in case of the Viltrox that image quality is not great to begin with, it's enough to read our image resolution chapter to find out why. Bad aspherical elements could significantly contribute to that weak result.
| 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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