LensTip.com

Lens review

Viltrox AF 23 mm f/1.4 XF

11 October 2020
Maciej Latałło

5. Chromatic and spherical aberration

Chromatic aberration

Unfortunately, two ED glass elements weren't enough to control efficiently longitudinal chromatic aberration. At the maximum relative aperture blurry areas feature a lot of colouring. Luckily you can limit it distinctly on stopping down the aperture to f/2.0.

Viltrox AF 23 mm f/1.4 XF - Chromatic and spherical aberration

What about the lateral chromatic aberration performance correlated with values of relative aperture? Let's look at the graph below.

Viltrox AF 23 mm f/1.4 XF - Chromatic and spherical aberration


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Compared to the longitudinal version of that aberration the situation is noticeably better. In the f/2.8-f/16 aperture range all results are below 0.04% so they can be called slight. A bit higher values we noticed by f/1.4 and f/2.0 but even there they didn't exceed 0.06% so, in our opinion, they still remain low. As a result we think lateral chromatic aberration won't bother you and will be very difficult to spot in real life photos.

In case of both types of aberration the Viltrox fares better than the more expensive Fujinon XF 23 mm f/1.4 R.

Fujifilm X-T2, RAW, f/1.4 Fujifilm X-T2, RAW, f/2.8
Viltrox AF 23 mm f/1.4 XF - Chromatic and spherical aberration Viltrox AF 23 mm f/1.4 XF - Chromatic and spherical aberration

Spherical aberration

It would be difficult to notice any 'focus shift' effect in first photos of this chapter so the level of spherical aberration can't be very high. Still, the appearance of out-of-focus circles of light we obtained before and behind the focal point proves spherical aberration hasn't been corrected perfectly well. They differ from each other distinctly; if that aberration was firmly controlled they should have been identical.

Fujifilm X-T2, f/1.4, before Fujifilm X-T2, f/1.4, after
Viltrox AF 23 mm f/1.4 XF - Chromatic and spherical aberration Viltrox AF 23 mm f/1.4 XF - Chromatic and spherical aberration