Carl Zeiss Batis 25 mm f/2
7. Coma, astigmatism and bokeh
| Center, f/2.0 | Corner APS-C, f/2.0 | Corner FF, f/2.0 |
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| Center, f/2.8 | Corner APS-C, f/2.8 | Corner FF, f/2.8 |
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Photos of the starry sky provide similar effect. Deformations aren’t huge but you can notice them without any problems; still taking into account the aperture fastness of the lens and its wide angle of view you shouldn’t complain too much.
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| A7R II, JPEG, f/2.0, right upper corner of the frame 1:1 |
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| A7R II, JPEG, f/2.8, right upper corner of the frame 1:1 |
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The astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to just 3.9% and shouldn’t be a distinct or noticeable problem.
Zeiss got us used to nice out-of-focus areas and circles with a very even light spread. Unfortunately the Batis 2/25 doesn’t fit that picture at all. There are many distinct ‘onion rings’ in circles generated for our test and on stopping down a lighter rim appears as well. Luckily the mechanical vignetting doesn’t seem especially pronounced.
| Center, f/2.0 | Corner APS-C, f/2.0 | Corner FF, f/2.0 |
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| 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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