Fujifilm Fujinon XF 27 mm f/2.8
5. Chromatic and spherical aberration
Chromatic aberration
Lateral chromatic aberration is not a problem for the tested Fujinon 2.8/27 as it is just marginal. Its negligible influence can be perceived only at the maximum relative aperture. Here the performance of the lens should be praised.
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Similar things can be said about the lateral chromatic aberration - no matter what aperture value you employ it stays very low so it shouldn’t bother you at all.
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Spherical aberration
Spherical aberration can be described in similar terms as the chromatic aberration. First of all the lens doesn’t have any “focus shift” effect and defocused light points you get in front of and behind the focus look almost the same. Such a performance is worth the best fixed-focal lenses and in the case of a small “pancake” instrument it can be called sensational.
