Sony FE 16-35 mm f/2.8 GM II
7. Coma, astigmatism and bokeh
| Center, 16 mm, f/2.8 | Corner APS-C, 16 mm, f/2.8 | Corner FF, 16 mm, f/2.8 |
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| Center, 24 mm, f/2.8 | Corner APS-C, 24 mm, f/2.8 | Corner FF, 24 mm, f/2.8 |
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| Center, 35 mm, f/2.8 | Corner APS-C, 35 mm, f/2.8 | Corner FF, 35 mm, f/2.8 |
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Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 6.9% and it is a level we still consider to be low. Some slight differences between particluar focal lengths are still visible because this aberration increases with the increase of the focal length: at 16 mm it reaches 3.5%, at 24 mm it is already 6.9%, and at 35 mm it amounted to 10.5%.
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The appearance of out-of-focus circles of light was a disappointment. Onion ring bokeh, stemming from the fact that there are a lot of aspherical elements inside this lens, makes itself felt. A distinctly brighter centre is visible in the middle of the rings. On stopping down the aperture you can also notice a brighter rim. The correction of mechanical vignetting should be praised though – it is bothersome only at the maximum relative aperture.
| Center, 35 mm, f/2.8 | Corner APS-C, 35 mm, f/2.8 | Corner FF, 35 mm, f/2.8 |
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| Center, 35 mm, f/4.0 | Corner APS-C, 35 mm, f/4.0 | Corner FF, 35 mm, f/4.0 |
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Center, 35 mm, f/5.6 | Corner APS-C, 35 mm, f/5.6 | Corner FF, 35 mm, f/5.6 |
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