Sony Carl Zeiss Sonnar T* FE 35 mm f/2.8 ZA
5. Chromatic and spherical aberration
Chromatic aberration
In the case of fixed focus f/2.8 lenses you rarely observe any problems connected to the longitudinal chromatic aberration and the Zeiss Sonnar 2.8/35 FE is not an exception to that rule. At the maximum relative aperture you see a slight colouring of out-of-focus images but it is certainly not a serious problem, especially as it disappears practically completely on stopping down the aperture by one step.
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The graph below shows that the lateral chromatic aberration is corrected very well too.
Regardless of the size of the detector and the relative aperture the values we measured never exceed 0.06%. It is a very low level so the lateral chromatic aberration shouldn’t bother you at all in real life photos.
| A7R II, RAW, f/2.8 | A7R II, RAW, f/11.0 |
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Aberracja sferyczna
The tested lens doesn’t show any “focus shift” effect or characteristic mist at the maximum relative aperture, two features most often connected to bad correction of spherical aberration. It might indicate the Sonnar 2.8/35 FE doesn’t have any noticeable problems in this area. A very slight influence of spherical aberration is noticeable only when you compare out-of-focus light circles created in front of and behind the focus. They don’t look the same because the circle after the focus has a slight rim on the edge.
| A7R II, f/2.8, in front of | A7R II, f/2.8, behind |
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