Nikon Nikkor Z 14-30 mm f/4 S
7. Coma, astigmatism and bokeh
| Center, 14 mm, f/4.0 | Corner APS-C, 14 mm, f/4.0 | Corner FF, 14 mm, f/4.0 |
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| Center, 22 mm, f/4.0 | Corner APS-C, 22 mm, f/4.0 | Corner FF, 22 mm, f/4.0 |
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| Center, 30 mm, f/4.0 | Corner APS-C, 30 mm, f/4.0 | Corner FF, 30 mm, f/4.0 |
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Similar situation can be observed when you take photos of a starry sky - one example of such a phenomenon we show below.
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| Nikon Z6, 14 mm, f/4.0, prawy-górny Corner 1:1 |
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Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 19.3% and it is a significant value. Still most of problems, connected to this aberration, you can experience at the maximum focal length where astigmatism level reaches 24.5% which is pretty high.
Defocused circles of light aren't perfect but it would be foolish to expect it from a lens with such parameters. After all its optical construction features as many as four aspherical elements – their presence is visible in the appearance of the circles as a slight onion-ring bokeh effect. What's interesting, at the maximum focal length the lens doesn't have any problems with mechanical vignetting as it appears only at the maximum relative aperture.
| Center, 30 mm, f/4.0 | Corner APS-C, 30 mm, f/4.0 | Corner FF, 30 mm, f/4.0 |
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| Center, 30 mm, f/5.6 | Corner APS-C, 30 mm, f/5.6 | Corner FF, 30 mm, f/5.6 |
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Center, 30 mm, f/8.0 | Corner APS-C, 30 mm, f/8.0 | Corner FF, 30 mm, f/8.0 |
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