Samyang AF 135 mm f/1.8 FE
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 16.3%. It's a value on the borderline between medium and high level so it adversely affects image quality near the maximum relative aperture. Still, the result of the Sony in this category was very similar.
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Defocused circles of light look very well. The light spread inside them is very even and the rim that appears on stopping down the aperture is not very intensive. Also in this category the Samyang deserves more praise than the Sony- the brand name lens couldn't get rid of mechanical vignetting even by f/3.5 and in the case of the Samyang mechanical vignetting disappears almost completely already by f/2.5.
| 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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