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Lens review

Samyang 35 mm f/1.2 ED AS UMC CS

26 November 2018
Arkadiusz Olech

5. Chromatic and spherical aberration

Chromatic aberration

Lenses with such a bright aperture can have a lot of problems with correction of longitudinal chromatic aberration but, fortunately, the Samyang 1.2/35 doesn’t have a slip-up in this category. A slight tint of out-of-focus images is noticeable; still, taking into account the parameters of the instrument, it is completely acceptable.

Samyang 35 mm f/1.2 ED AS UMC CS - Chromatic and spherical aberration


The graph below shows how the Samyang 1.2/35 performs when it comes to the lateral chromatic aberration.

Samyang 35 mm f/1.2 ED AS UMC CS - Chromatic and spherical aberration


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It is clear that aberration is corrected in a perfect way. In the f/2.8 – f/16 range you deal with a completely imperceptible level, about 0.02%. The highest value you can observe at the maximum relative aperture but even there it is just a bit over 0.04% so on a borderline between very low and low levels.

Fujifilm X-T2, RAW, f/1.2 Fujifilm X-T2, RAW, f/5.6
Samyang 35 mm f/1.2 ED AS UMC CS - Chromatic and spherical aberration Samyang 35 mm f/1.2 ED AS UMC CS - Chromatic and spherical aberration


Spherical aberration

You can have some reservations concerning spherical aberration for a change. First photos of this chapter show focus shift – on stopping down the depth moves slightly towards greater distances. What’s more, defocused circles of light, reached before and after the focus, feature distinct differences characteristic for not completely corrected spherical aberration, like soft edges on the one side and slight rim on the other side. You can say spherical aberration contributes to worsening of image quality near the maximum relative aperture.

X-T2, f/1.2, in front of X-T2, f/1.2, behind
Samyang 35 mm f/1.2 ED AS UMC CS - Chromatic and spherical aberration Samyang 35 mm f/1.2 ED AS UMC CS - Chromatic and spherical aberration