Olympus M.Zuiko Digital 7-14 mm f/2.8 ED PRO
5. Chromatic and spherical aberration
Chromatic aberration
The longitudinal chromatic aberration is not corrected in a perfect way and the photos below prove that much. You can notice slight coloration of the off-focus images; fortunately that effect is not especially pronounced.
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A graph below presents the performance of the lateral chromatic aberration at individual focal lengths.
The highest level of that aberration can be seen at the shortest focal length, reaching 0.09% . Still that value constitute a borderline between low and medium levels so it would be difficult to complain. At the longer focal lengths the situation is even better – at 10 mm the results we got didn’t exceed 0.06% and at 14 mm they kept near 0.07%.
The performance of the tested lens in this category should be assessed very positively, especially if you take into account the fact that its parameters are difficult to obtain and correct.
| E-PL1, RAW, 7 mm, f/8.0 | E-PL1, RAW, 10 mm, f/5.6 |
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Spherical aberration
First photos in this chapter clearly show the lens doesn’t have any problems with the “focus shift” effect. The circles of light we got in front of and behind the focal point are perhaps not completely identical but they lack really disturbing features as well. It makes us say the Olympus 7-14 mm doesn’t have any noticeable problems with the spherical aberration correction.
| E-M10, 14 mm, f/2.8, in front of | E-M10, 14 mm, f/2.8, behind |
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