Panasonic G Macro 30 mm f/2.8 ASPH. MEGA O.I.S.
5. Chromatic and spherical aberration
Chromatic aberration
The Panasonic 2.8/30 doesn’t have almost any problems with the correction of the longitudinal chromatic aberration. You have to take a very close look at the areas outside the focus to notice any colouring in them.
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Now let’s check the situation concerning the lateral chromatic aberration – the appropriate graph is situated below.
The highest value, slightly exceeding 0.08%, we saw at the maximum relative aperture. On stopping down that aberration level decreases and in a range from f/4.0 to f/22 it keeps a steady level of about 0.05%. All these values are not especially bothersome so our assessment of the Panasonic’s 2.8/30 lateral chromatic aberration correction must be very positive.
| Olympus E-PL1, f/2.8 | Olympus E-PL1, f/8.0 |
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Spherical aberration
In the first photo of this chapter it would be difficult to notice any “focus shift” effect. Additionally the circles of light we got in front of and behind the focus don’t differ from each other. As a result we think the tested lens doesn’t have any spherical aberration problems.
| Olympus E-M10, f/2.8, in front of | Olympus E-M10, f/2.8, behind |
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