Nikon Nikkor Z 50 mm f/1.2 S
7. Coma, astigmatism and bokeh
Similar 'wings' were visible also in the test of the Sony 1.2/50 GM but in its case they could be noticed only in the corner of full frame. In the corners of the smaller sensor diode images remained point-like even at the maximum relative aperture so we think that in this category the Sony fared a tad better.
| Center, f/1.2 | Corner APS-C, f/1.2 | Corner FF, f/1.2 |
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| Center, f/1.8 | Corner APS-C, f/1.8 | Corner FF, f/1.8 |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 15.1%. It is a medium value, a bit lower than the astigmatism level of the Sony lens.
The appearance of out-of-focus areas seem to be very pleasing to the eye but, as we've already mentioned, it's a matter of taste. Light spread in the circles is even and, despite using aspherical elements, onion-ring bokeh is just slightly visible – you can notice it only when you take a closer look. A brighter rim that appears on a more significant stopping down is not especially intensive. Mechanical vignetting is distinct only by f/1.2; by f/1.8 it is already low and by f/2.5 it disappears completely.
| Center, f/1.2 | Corner APS-C, f/1.2 | Corner FF, f/1.2 |
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| Center, f/1.8 | Corner APS-C, f/1.8 | Corner FF, f/1.8 |
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Center, f/2.5 | Corner APS-C, f/2.5 | Corner FF, f/2.5 |
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