Voigtlander Nokton 35 mm f/0.9 Aspherical
7. Coma, astigmatism and bokeh
On stopping down the aperture by 1 EV coma decreases noticeably but still it remains huge. In this category the Voigtlander should be criticized rather harshly.
| X-T2, f/0.9, center | X-T2, f/0.9, Corner |
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| X-T2, f/1.3, center | X-T2, f/1.3, Corner |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 22.5%. It is a significant value, and, what's important, it makes itself felt even on stopping down the aperture.
Defocused circles of light look sensibly well when it comes to light spread but I admit I expected a better performance from a lens with such a speed. Here you see noticeable onion ring bokeh and, what's more, even thought the number of diaphragm blades is really high, reaching 12, they are not circular so, after stopping down, you deal with angular polygons. Mechanical vignetting also adds to that situation as it doesn't disappear completely even after stopping down the aperture by 2 EV.
| X-T2, f/0.9, center | X-T2, f/0.9, Corner |
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| X-T2, f/1.3, center | X-T2, f/1.3, Corner |
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| X-T2, f/1.8, center | X-T2, f/1.8, Corner |
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