Voigtlander Apo Lanthar 50 mm f/2 Aspherical
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 2.0%. It is a very small value so the lens once again deserves to be praised.
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The topic of defocused circles of light we found very interesting. Firstly, the lens contains two double-sided aspherical elements and because of them in blurry areas you can notice perhaps not fully-fledged onion-ring bokeh but rather some fine texture. Mechanical vignetting also makes itself felt - its level is high by f/2.0, medium by f/2.8, and it disappears completely by f/4.0. The performance of the aperture is also unusual. At the maximum relative aperture and by f/2.8 you get a very nice, round shape of circles of light, without any bright rim. From f/4.0 onwards the aperture starts looking like a multi-pointed star so the images become really interesting. Can you call it also pleasing to the eye? It's a matter of taste; personally I am glad the producers try to be original and offer you something different than the rivals.
| 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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