Voigtlander Nokton 35 mm f/0.9 Aspherical
5. Chromatic and spherical aberration
Chromatic aberration
In case of the Voigtlander, tested here, you deal with a lens with an excellent aperture fastness, that of f/0.9, and virtually no low dispersion elements. I admit it made us a bit apprehensive before the longitudinal chromatic aberration test. We shouldn't have worried. This aberration's level is almost imperceptible, with slight colouring of out-of-focus images even at the maximum relative aperture. |
Now let's check the correction of lateral chromatic aberration – an appropriate graph, presenting its performance in relation to aperture values, can be found below.
Please Support UsIf you enjoy our reviews and articles, and you want us to continue our work please, support our website by donating through PayPal. The funds are going to be used for paying our editorial team, renting servers, and equipping our testing studio; only that way we will be able to continue providing you interesting content for free. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
It's clear this aberration depends weakly on the employed aperture and keeps near 0.08%, a value on the borderline between low and medium values. As you see, there's nothing to worry about.
| Fujifilm X-T2, RAW, f/0.9 | Fujifilm X-T2, RAW, f/11.0 |
|
|
Spherical aberration
In the first photos of this chapter you can notice distinct focus shift. As you pass from f/0.9 to f/1.4 the depth of field moves toward greater distances, a classic symptom of badly corrected spherical aberration.The appearance of out-of-focus circles of light confirms the existence of this aberration without any doubt. In one case you get a distinctly brighter rim, in the other soft edges, both being classic symptoms of bad correction of spherical aberration.
We don't doubt that badly corrected spherical aberration contributes to a weaker performance of the Nokton near the maximum relative aperture.
| Fujifilm X-T2, f/0.9, before | Fujifilm X-T2, f/0.9, after |
|
|
