Voigtlander Nokton 50 mm f/1.2 Aspherical review - Coma, astigmatism and bokeh

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Voigtlander Nokton 50 mm f/1.2 Aspherical

5 May 2020

Maciej Latałło

7. Coma, astigmatism and bokeh

Coma could be pretty severe in case of optically simple 1.4/50 class lenses. Taking into account the fact that the Nokton features a superior aperture fastness we really didn't expect any miracles in this category. And indeed, we were right. There is just one consolation: coma remains quite harmless on the smaller APS-C sensor. Unfortunately, in the corners of full frame it becomes quite distinct, seriously influencing the performance in the frame corners in a negative way. Another piece of bad news: coma remains visible even on stopping down the aperture by 1 EV.

Center, f/1.2	Corner APS-C, f/1.2	Corner FF, f/1.2

Center, f/1.7	Corner APS-C, f/1.7	Corner FF, f/1.7

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 14%. It is a result which we still consider to be medium but it contributes to worsening of image quality for sure.

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Defocused circles of light look pretty well with even light spread, not perfect in some places but still acceptable. A lighter rim is weak and appears only on more significant stopping down. Mechanical vignetting is visible at the maximum relative aperture and on stopping down by 1 EV but later on it ceases to be a problem.

Center, f/1.2	Corner APS-C, f/1.2	Corner FF, f/1.2

Center, f/1.7	Corner APS-C, f/1.7	Corner FF, f/1.7

Center, f/2.5	Corner APS-C, f/2.5	Corner FF, f/2.5