Sony FE 40 mm f/2.5 G
7. Coma, astigmatism and bokeh
| 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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Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 6.0%. It is a slight value so, once again, you can't find any trace of any negative effects of compromises.
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Defocused circles of light look sensibly well. You can notice the effect of using aspherical elements in the construction so onion-ring bokeh structure is easy to spot. Mechanical vignetting is very strong by f/2.5 but, fortunately, it disappears completely on stopping down the aperture by 2 EV.
| 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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Center, f/5.0 | Corner APS-C, f/5.0 | Corner FF, f/5.0 |
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