Samyang AF 35 mm f/1.8 FE
5. Chromatic and spherical aberration
Chromatic aberration
Producers didn't add any low dispersion elements to the optical construction of this lens and here you see the result – longitudinal chromatic aberration makes itself felt a bit at the maximum relative aperture. It decreases noticeably on stopping down the lens by 1 EV but even then it leaves some visible traces. That performance is perhaps not completely bad but the lens definitely is less than perfect in this category. |
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It is clear that aberration very weakly depends on aperture values and the type of used detector. You get results on a quite fixed level, ranging from 0.06-0.08% - they mean this aberration won't bother you in real life photos.
| A7R III, RAW, f/1.8 | A7R III, RAW, f/11.0 |
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Spherical aberration
In first photos from this chapter you can notice a very slight shift of focus as you pass from f/1.8 to f/2.5. It means that spherical aberration is not corrected in a perfect way. Defocused circles of light confirm that conclusion – one of them features soft edges while the other one has a distinct, brighter rim. It is a classic symptom of spherical aberration; even though its level is not especially high, the producers didn't manage to correct it completely well.
| A7R III, f/1.8, before | A7R III, f/1.8, after |
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