Voigtlander Apo-Lanthar 65 mm f/2 Aspherical 1:2 Macro
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, is, like coma, hardly bothersome at all. Its value we assessed as 5.9% and we consider such a result to be good. It’s worth noticing that the aberration’s influence is the highest at the maximum relative aperture; by f/2.8 and f/4.0 it reaches a level of 2-3% at the most.
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Blurry area produced by the tested lens look good but if you examine them thoroughly you can find several disturbing features. First, even if the aperture has as many as 10 diaphragm blades it can hardly be called round. Secondly, the presence of an aspherical element makes itself felt in a form of onion rings bokeh. Thirdly, it would be difficult not to notice huge mechanical vignetting as distinct truncation of circles in the frame corners.
| 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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