Yongnuo YN 35 mm f/2.0
5. Chromatic and spherical aberration
The longitudinal chromatic aberration is not a serious problem for the Yongnuo 2/35 although its slight influence remains noticeable. It is a nice piece of news, especially if you compare it to the performance of e.g. the much more expensive Nikkor AF-S 35 mm f/1.8G ED. On the other hand that result is not as good as the result of the Canon EF 35 mm f/2 IS USM.
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Also in the case of the lateral chromatic aberration there are no reasons to complain. The highest level of that aberration can be noticed at the maximum relative aperture but even there it should be considered imperceptible.
| Canon 5D III, f/2.0 | Canon 5D III, f/5.6 |
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Spherical aberration
When it comes to the spherical aberration it is certainly not corrected in a perfect way. Firstly, on passing from f/2.0 to f/2.8 you see that the depth of field moves a bit towards the longer distances. It constitutes a small “focus shift” effect. Secondly the appearance of defocused light circles also leaves plenty to be desired. It is conspicuous that the circle in front of the focus has a light centre and the circle behind the focus – a dark centre.
| Canon 5D III, f/2.0, in front of | Canon 5D III, f/2.0, behind |
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