Voigtlander Nokton 25 mm f/0.95
7. Coma and astigmatism
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Very fast lenses often have a lot of coma-related issues and the Voigtlander is not an exception to this rule. The level of this aberration is really huge and on stopping down to f/1.4 we don’t see almost any improvement – the coma more or less keeps the same level.
When it comes to astigmatism the lens performs much better. It is perhaps not corrected in a perfect way but certainly well enough - the average difference between horizontal and vertical MTF50 function values amounted to 6.8%.
