Samyang AF 35-150 mm f/2-2.8 FE
4. Chromatic and spherical aberration
Chromatic aberration
The Samyang AF 35-150 mm f/2-2.8 FE is simply peppered with special glass elements so we didn't expect any significant problems with the correction of the longitudinal chromatic aberration. Indeed, there are no problems – a very slight colouring of images in out-of-focus areas positioned further away is the only thing you can notice. Apart from that, this effect is visible only at the shortest focal lengths and only very close to the maximum relative aperture.![]() |
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The high amount of special elements doesn't perform so well as before – this remark concerns mainly the maximum focal length. At that place exactly the lateral chromatic aberration increases on stopping down the aperture, reaching near 0.12% at the maximum. It is already a noticeable value, one of the reasons why the Samyang fares so weakly on the edge of the frame. It's also worth mentioning here that the rival Tamron didn't exceed 0.08% practically at any place so in this category performed noticeably better.
Fortunately in case of the Samyang shorter focal lengths don't give you any reasons to complain. At 35 and 105 mm focal lengths you see results that can be described as low and at the 70 mm focal length they remain on the borderline between low and very low values.
A7R IIIa, RAW, 70 mm, f/8.0 | A7R IIIa, RAW, 150 mm, f/16.0 |
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Spherical aberration
In first photos of this chapter at any examined focal length you can notice a slight shift of depth of field towards greater distances on stopping down the aperture by 1 EV. Additionally shots of defocused circles of light, showed below, show that in one case you deal with a distinctly brighter rim and the other lacks it completely. Both these phenomena suggest that the Samyang 35-150 mm didn't manage to correct spherical aberration in a perfect way. In this category the tested Samyang performs similarly to the Tamron.
A7R IIIa, 35 mm, f/2.0, before | A7R IIIa, 35 mm, f/2.0, after |
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A7R IIIa, 85 mm, f/2.8, before | A7R IIIa, 85 mm, f/2.8, after |
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A7R IIIa, 150 mm, f/2.8, before | A7R IIIa, 150 mm, f/2.8, after |
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