Fujifilm Fujinon XF 23 mm f/2.8 R WR
5. Chromatic and spherical aberration
Chromatic aberration
Although the Fujinon XF 23 mm R WR is a lens with a relatively simple optical construction without any low dispersion glass elements, it still corrects longitudinal chromatic aberration pretty well. Thumbnails presented by us below prove that much. |
The correction of lateral chromatic aberration can be described in similar terms – it's enough you look at a graph, below, to assess its performance.
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The described aberration only weakly depends on the aperture value and it increases slightly from 0.02% at the maximum relative aperture to near 0.03% for apertures closed down. All these values, with a lot of spare, fit very low levels so in this category the tested Fujinon deserves to be praised.
| Fujifilm X-T2, RAW, f/2.8 | Fujifilm X-T2, RAW, f/5.6 |
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Spherical aberration
In first photos from this chapter you can notice slight focus shift. As you stop the aperture down the depth of field moves slightly towards greater distances.Out-of-focus circles of light we got before and behind the focus don't differ much from each other for a change. If you add to that the good image quality the Fujinon offers already up from the maximum relative aperture you can state that spherical aberration, although not corrected in a perfect way, is certainly not a significant problem.
| Fujifilm X-T30, f/2.8, before | Fujifilm X-T30, f/2.8, after |
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