Viltrox AF 16 mm f/1.8
5. Chromatic and spherical aberration
Chromatic aberration
Fast ultra wide angle lenses are not that easy to correct when it comes to longitudinal chromatic aberration and Viltrox optics speciallists were fully aware of that. That's why they added a right number of low dispersion glass elements and with a good result. In the photos we show below there is no distinct colouring of out-of-focus areas visible anywhere, even at the maximum relative aperture. |
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Now let's check the correction of lateral chromatic aberration – an appropriate graph you can find below.
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It's obvious that also in this place the tested lens should be praised a lot – all its results are on the borderline between very low and low levels. The performance of the more expensive Sony FE 16 mm f/1.8G are very similar in this category.
| A7R IIIa, RAW, f/1.8 | A7R IIIa, RAW, f/2.8 |
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Spherical aberration
In the first photos of this chapter it would be difficult to notice any focus shift effect. When it comes to the appearance of out-of-focus circles of light we reached before and behind the focus there are no significant differences even though they are not identical. Both these facts, joined with a good image quality in the frame centre up from the f/1.8 aperture, allow us to say that the Viltrox 1.8/16 doesn't have any distinct problems with the correction of spherical aberration.
| A7R IIIa, f/1.8, before | A7R IIIa, f/1.8, after |
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