Sigma A 35 mm f/1.2 DG II
5. Chromatic and spherical aberration
Chromatic aberration
When it comes to longitudinal chromatic aberration, the 1.2/35 parameters are very difficult to correct; still the new Sigma tackles this problem very well and crops below are the proof. Once again in this category, the new lens performs better than its predecessor. |
Now let's check the correction of lateral chromatic aberration – an appropriate graph you can find below.
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The results on the edge of the APS-C/DX sensor and on the edge of full frame don't differ from each other a lot, ranging from 0.03 to 0.04%. These are values on the borderline of low and very low levels, so once again the performance can only be praised.
The new Sigma performs here like its predecessor and the Viltrox, being at the same time a tad better than the Nikkor.
| A7R IIIa, RAW, f/1.2 | A7R IIIa, RAW, f/5.6 |
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Spherical aberration
The first photos from this chapter show a slight focus shift, but only after passing from f/1.8 to f/2.5. This effect is not especially pronounced. In case of out-of-focus circles of light we got before and behind the focus, the situation is a bit different. Here you see the classic symptom of spherical aberration – the first circle has soft edges and the second one features a very clear, bright rim.Lack of distinct focus shift and excellent image quality up from the maximum relative aperture suggest that the level of spherical aberration cannot be high and it certainly shouldn't be added to the cons list. Of course you should mention the fact that it might reach medium levels and affect final images.
| A7R V, f/1.2, before | A7R V, f/1.2, after |
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