Fujifilm Fujinon XC 16-50 mm f/3.5-5.6 OIS
5. Chromatic and spherical aberration
The longitudinal chromatic aberration is corrected very well – the tested lens has no problems with it. The photos below show it perfectly clear.
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When it comes to the lateral chromatic aberration the Fujinon 16-50 mm corrects it weakly at the shortest focal length – with the lens fully open you get a result of 0.18% which can be only described as high.
As a consolation you might add that in the middle of the focal range the aberration becomes low and then it increases when you pass to 50 mm but still it can be described just as average there.
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Spherical aberration
Although the lens doesn’t have any ‘focus shift’ tendencies, the spherical aberration is not corrected in a perfect way – the defocused images of light points, shown below are the proof. The image you get in front of the focus has a distinct rim on the edge while he circle behind the focal point has a noticeable brightness loss near the very end.
