Voigtlander Nokton 10.5 mm f/0.95
7. Coma, astigmatism and bokeh
| E-M10, 10.5 mm, f/0.95, center | E-M10, 10.5 mm, f/0.95, corner |
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| E-M10, 10.5 mm, f/1.4, center | E-M10, 10.5 mm, f/1.4, corner |
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It is not the end of problems. The coma makes itself felt not only in the very corners of the frame. Among our sample shots you can find photos of the night sky which allow you to assess the full extent of the problem. The crop presented below is a 1:1 photo of the sky taken by f/0.95, featuring the Lyra constellation and its brightest star, Vega. The area shown here was situated in the photo about half the distance between the corner and the center of the frame; still as you can clearly notice the coma remains very pronounced, contributing greatly to the worsening of the image quality on the edge of the frame and its extended neighbourhood.
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| Olympus E-M10, JPEG, f/0.95, exp. 20 s. |
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Another off-axis aberration, the astigmatism, is also corrected badly. The average difference between horizontal and vertical MTF50 function values amounted to as much as 25%. What’s more, that aberration is still distinctly visible by f/4.0 and f/5.6. Only near f/8.0 it becomes slight. These results are very bad indeed…
When it comes to the appearance of blurry areas there are no good news either. The light spread in the circles is far from even and the darkening of the circle, connected to the vignetting, is visible not only in the frame corners. Additionally you can spot a net of concentric circles. There is another problem: it seems in order to get nice, round circles it is not enough to use a lot of aperture blades, you should also focus on rounding them properly. The Voigtlander clearly failed here as well - despite ten blades, it would be difficult to call the image of its aperture round…
| E-M10, 10.5 mm, f/0.95, center | E-M10, 10.5 mm, f/0.95, corner |
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| E-M10, 10.5 mm, f/1.4, center | E-M10, 10.5 mm, f/1.4, corner |
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| E-M10, 10.5 mm, f/2.0, center | E-M10, 10.5 mm, f/2.0, corner |
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