Carl Zeiss Batis 40 mm f/2 CF
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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Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 7.2% and it is a moderate level. As you see, we have no reasons to complain in that category either.
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Defocused circles of light are pleasing to the eye. They are characterized by smooth light spread inside; onion-ring bokeh, a result of employing aspherical elements, is not especially bothersome. Mechanical vignetting is visible but decreases quickly and by f/2.8 its level is already low; by f/4.0 it disappears completely. As you see it's another category where the performance of the Batis remains beyond reproach.
| 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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