Sony FE 135 mm f/1.8 GM
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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Astimatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 17.3%. It's a value on the borderline between medium and high level so it contributes noticeably to the worsening of image quality near the maximum relative aperture.
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Defocused circles of light look very well. Light spread inside them is very even, a rim that appears on stopping down not especially intensive. Too pronounced influence of mechanical vignetting is the only thing that I don't like here. In a telephoto lens of such physical dimensions mechanical vignetting might be noticed only at the maximum relative aperture and perhaps also on stopping down the aperture by 1 EV stop. In the case of the Sony you can see a slight truncation of the circle even after you stop down the aperture by 2 EV.
| 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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