Sony E 15 mm f/1.4 G
5. Chromatic and spherical aberration
Chromatic aberration
There are two special elements made of low dispersion glass (ED and SuperED one) in the optical construction of the Sony E 15 mm f/1.4G and it might suggest longitudinal chromatic aberration might be corrected properly well. Unfortunately our test showed its correction is not ideal. Colouring of out-of-focus images is visible both at the maximum relative aperture and on stopping down the aperture by 1 EV.Still it should be mentioned that the level of this aberration is not high and, overall, the performance is very similar to the one of the rival Sigma.
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When it comes to the correction of lateral aberration you get close to a draw as well – let's glance at a graph, presented below.
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In the case of the Sony aberration increases to about 0.06% at the maximum relative aperture and is a bit less than 0.09% on stopping down. In the case of the Sigma the graph is a bit flatter and the results range from 0.06 to 0.07%. In both cases you see very similar values and all of them can be described as low.
| A7R III, RAW, f/1.4 | A7R III, RAW, f/11.0 |
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Spherical aberration
The Sigma C 16 mm f/1.4 DC DN had some problems with spherical aberration and they manifested themselves both as the focus shift effect and in the appearance of out-of-focus circles of light.At the maximum relative aperture the Sony lens fared distinctly better than the Sigma in the resolution category - it suggested it might experience less problems with spherical aberration and it is indeed the case. You won't get any focus shift effect and circles of light reached before and behind the focus are very similar. Spherical aberration correction seems to be beyond reproach.
| A7R III, f/1.4, before | A7R III, f/1.4, after |
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