Samyang AF 85 mm f/1.4 FE/RF
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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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to just 2.9% which we consider a very low value. What's interesting, the cheaper Samyang once again prevails over the Sony GM 1.4/85.
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The appearance of out-of-focus, blurry areas we find completely acceptable - on stopping down the aperture you can notice a lighter rim but the effect is hardly bothersome. Still mechanical vignetting remains a serious problem – it truncates the circle very distinctly by f/1.4 and remains quite visible by f/2.0.
| 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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