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Correcting color aberrations with the 12mm f/2
The Olympus Zuiko 12mm f/2 is a very fine lens, but does have some modest uncorrected color errors, both lateral chromatic aberration (color fringing) and longitudinal chromatic aberration (violet haze around high contrast edges).
These aberrations are easily corrected in Photoshop CS6 when converting with Adobe Camera RAW.
Stopping down eliminates the axial chromatic aberration, but lateral chromatic aberration does not improve with stopping down. For more on lens aberrations, see Making Sharp Images.
Example at f/2
Corrected for lateral chromatic aberration via the checkbox. Corrected for longitudinal (axial) chromatic aberration via .
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