Sony FE 16 mm f/1.8 G
5. Chromatic and spherical aberration
Chromatic aberration
On the one had you deal here with a fast, wide angle construction, in which case correction of longitudinal chromatic aberration is always a huge challenge. On the other hand the producers knew very well the difficulty level and that's why they put inside the optical construction as many as four elements made of low dispersion glass of different types. As a result the Sony FE 16 mm f/1.8 G doesn't have any significant problems with this aberration and photos, shown below prove that pretty well. |
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Now let's check how the tested lens corrects lateral chromatic aberration – a graph below presents its performance depending on the aperture value and the size of used detector.
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With such a wide angle of view and good aperture fastness correction of this type of aberration is also extremely difficult. Still the tested Sony managed here just fine. The majority of the results is below 0.04% - it means that they belong to negligible or very low values. Higher results are visible only on the edge of the APS-C sensor and close to the maximum relative aperture but even there you can classify them as low. The tested lens deserves to be praised in this area for sure.
It's worth adding that the 16 mm fares here a tad better than the 14 mm instrument but it lags behind the outstanding performance of the 20 mm lens.
| A7R IIIa, RAW, f/1.8 | A7R IIIa, RAW, f/11.0 |
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Spherical aberration
First photos from this chapter don't show any noticeable focus shift effects. Also the appearance of out-of-focus circles of light we got before and behind the focus don't show any more serious problems with spherical aberration. They are perhaps not identical but they also don't feature any essential differences. Both these facts, joined with a very good image quality in the frame centre up from f/1.8 allow us to think that the Sony FE 16 mm f/1.8 G doesn't have any noticeable problems with correction of spherical aberration.
| A7R IIIa, f/1.8, before | A7R IIIa, f/1.8, after |
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