Olympus M.Zuiko Digital 17 mm f/1.8
5. Chromatic and spherical aberration
Chromatic aberration
The longitudinal chromatic aberration is corrected well – off focus images near the maximum relative aperture are just slightly coloured and that effect shouldn’t be bothersome in real life photos.
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Lateral chromatic aberration might prove to be more troublesome. That aberration seems to be independent of the value of the aperture and its level is situated near 0.12% across the whole aperture range. It is a level we consider medium.
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Spherical aberration
Spherical aberration can be described in similar terms as the chromatic aberration. It is not corrected in a perfect way because there are differences between images of a defocused diode we got in front of and behind the focus; still that effect is not high so there are no serious reasons to complain.
