Fujifilm Fujinon XF 18-55 mm f/2.8-4 OIS
5. Chromatic and spherical aberration
Chromatic aberration
The correction of the longitudinal chromatic aberration is not a strong point of the Fujinon 18-55 mm. As you can notice in the photos posted below that aberration makes itself felt both at the maximum relative aperture and on stopping down by 1 EV, where its level doesn’t seem noticeably lower.
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The lateral chromatic aberration results are a bit better. In the middle of the focal range you can’t notice it practically at all. It is not a problem at the shortest focal length either, where, even at its worst, it never reaches a medium level. The biggest chances to perceive that aberration exist for the combination of the maximum relative aperture and the maximum focal length - it reaches 0.11% there. Still it remains on a level we consider medium so in this category the lens can be only praised. The Sigma 17-70 mm, mentioned before, at the shortest focal length could exceed 0.14% so fared definitely worse.
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Spherical aberration
First photos from this chapter show that the lens doesn’t have any serious problem with correcting the spherical aberration – there is no ‘focus shift’. Still that aberration isn’t corrected in a perfect way either, and images of defocused light points are the proof. The circles you get in front of and behind the focus differ greatly – one of them features a noticeably lighter rim on the edge and the second one becomes darker as you progress towards its edges.
