Carl Zeiss Otus 28 mm f/1.4
5. Chromatic and spherical aberration
Chromatic aberration
You have to look really long and hard at crops presented below to notice even traces of colouring in out-of-focus images. It means the Otus 1.4/28 deals with the longitudinal chromatic aberration exceedingly well.
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The graph below shows the performance of the tested lens when it comes to the correction of the lateral chromatic aberration.
The situation here is very similar to the one concerning the longitudinal variation of this aberration. Most of results stay near 0.03% - a very low level in our opinion. It means it would be hard to notice any of these chromatic aberrations in real life photos.
| Canon 5D III, f/1.4 | Canon 5D III, f/16.0 |
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Spherical aberration
First photos of this chapter don’t show any ‘focus shift’ effect so the level of spherical aberration cannot be really high. Still if you consult defocused light circles we got in front of and behind the focal point you might notice there are some problems. One of the circles has distinctly lighter edges and the second one becomes darker when you approach the edge of the circle. It is a classic symptom of spherical aberration not corrected as well as it should be.
| Canon 5D III, f/1.4, in front of | Canon 5D III, f/1.4, behind |
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