Sony FE 90 mm f/2.8 Macro G OSS
7. Coma, astigmatism and bokeh
| Center, f/2.8 | Corner APS-C, f/2.8 | Corner FF, f/2.8 |
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| Center, f/4.0 | Corner APS-C, f/4.0 | Corner FF, f/4.0 |
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Astigmatism, understood as an average difference between vertical and horizontal MTF function values, amounted to 4.6%. We consider it to be a low level so we have no reservations in this testing category.
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The appearance of out-of-focus images is good. You can notice a slight trace of onion ring bokeh due to one aspherical element in the lens's construction; also, on stopping down, there is a lighter rim which might be a bit bothersome. Still both these effects aren't especially pronounced so the circles of light look nice and well. Mechanical vignetting is a problem, though – by f/2.8 it is very distinct and it never disappears completely even on stopping down the aperture by 2 EV.
| Center, f/2.8 | Corner APS-C, f/2.8 | Corner FF, f/2.8 |
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| Center, f/4.0 | Corner APS-C, f/4.0 | Corner FF, f/4.0 |
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Center, f/5.6 | Corner APS-C, f/5.6 | Corner FF, f/5.6 |
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