Sony FE 20 mm f/1.8 G
5. Chromatic and spherical aberration
Chromatic aberration
If a lens features as many as three low dispersion glass elements inside you can assume it will correct longitudinal chromatic aberration without any problems. Indeed the Sony FE 1.8/20G manages in this category very well - the aberration won't bother you even at the maximum relative aperture. Still, you have to notice the fact that its rivals haven't had any difficulties in this area either. |
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Once again you deal with excellent results. No matter what aperture and what detector you employ the lens's aberration lands near 0.02-0.03% - these are very small values. Here the Sony fares slightly better than the Nikkor and the Viltrox, distinctly better than the Tokina. Of course once again you have to emphasize the fact that none of these lenses had any serious slip-ups in this category.
| A7R III, RAW, f/1.8 | A7R III, RAW, f/11.0 |
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Spherical aberration
Even after a very close look it would be difficult to find any traces of focus shift in first photos of this chapter. Some symptoms of less-than-perfect correction of spherical aberration still can be visible in circles of light we got before and behind the focus: in the first case you get soft edges, in the second- a slightly accented rim. Still, this effect is not especially noticeable.Lack of focus shift and a very good quality of images in the frame centre by f/1.8 indicate that problems with spherical aberration, even if present, aren't really pronounced.
| A7R III, f/1.8, before | A7R III, f/1.8, after |
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