LensTip.com

Lens review

Samyang AF 35 mm f/1.8 FE

7 May 2021
Maciej Latałło

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.

Samyang AF 35 mm f/1.8 FE - Chromatic and spherical aberration

Now let's check how the lens corrects lateral chromatic aberration.

Samyang AF 35 mm f/1.8 FE - Chromatic and spherical aberration


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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
Samyang AF 35 mm f/1.8 FE - Chromatic and spherical aberration Samyang AF 35 mm f/1.8 FE - Chromatic and spherical aberration

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
Samyang AF 35 mm f/1.8 FE - Chromatic and spherical aberration Samyang AF 35 mm f/1.8 FE - Chromatic and spherical aberration