Viltrox AF 35 mm f/1.7 Air
5. Chromatic and spherical aberration
Chromatic aberration
Despite its affordable price, the optical construction of the Viltrox AF 35 mm f/1.7 Air features quite a lot of special elements – one element made of low dispersion ED glass, two made of glass with high refraction index. Small wonder the tested lens doesn't experience practically any problems with the correction of longitudinal chromatic aberration, photos below show clearly. |
Now let's check how the Viltrox AF 35 mm f/1.7 Air corrects lateral chromatic aberration – an appropriate graph, you can find below.
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Here the Viltrox can only be praised. The aberration practically doesn't depend on the aperture, keeping a constant level from 0.02 to 0.03% we consider to be very low. A loud round of applause, please!
| Fujifilm X-T2, RAW, f/1.7 | Fujifilm X-T2, RAW, f/2.8 |
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Spherical aberration
In first photos of this chapter you can notice a slight focus shift. When you stop the aperture down depth of field moves a bit toward shorter distances.A very slight influence of spherical aberration can also be noticed in out-of-focus circles of light reached before and behind the focus. The rim is a bit more accented in the first circle, the second circle lacks it. Still such an effect is not especially pronounced.
It's clear that the producers of the tested Viltrox didn't correct spherical aberration in a perfect way, leaving it on a moderate level. Of course we are sure this aberration cannot be very high because its symptoms are slight; at the same time the lens provides you very good resolution up from the maximum relative aperture both in the frame centre and on its edges.
| Fujifilm X-T30, f/1.7, before | Fujifilm X-T30, f/1.7, after |
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