Voigtlander Nokton 42.5 mm f/0.95
5. Chromatic and spherical aberration
Despite its great aperture fastness the Voigtlander 0.95/42.5 doesn’t have any problems with the longitudinal chromatic aberration. In this category it differs significantly from the PanaLeica 1.2/42.5 which was slower and still experienced a lot of problems.
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When it comes to the lateral chromatic aberration the situation is reversed: the Voigtlander fares a bit worse. The aberration in its case increases from 0.07% near the maximum relative aperture to almost 0.12% after more significant stopping down. At the maximum aperture and near it you can still speak about low values of that aberration but after stopping down it can be described already as medium.
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Spherical aberration
Spherical aberration can be noticed without any problems practically everywhere. In the left panel of the first photo you can notice distinct mist, a very characteristic trait of badly corrected spherical aberration. What’s more, that photo also shows a slight back focus when you pass from f/0.95 to f/1.4.
Defocused images of light points expose that aberration in full. The circle you get in front of the focus has noticeably lighter centre and the brightness decrease on its edge is very pronounced. In the image behind the focus that effect is definitely less visible.
