Venus Optics LAOWA 7.5 mm f/2 MFT review - Chromatic and spherical aberration

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Venus Optics LAOWA 7.5 mm f/2 MFT

9 October 2017

Arkadiusz Olech

5. Chromatic and spherical aberration

Chromatic aberration

The longitudinal chromatic aberration is corrected by the Laowa very well. It’s difficult to notice any distinct colouring of images even at the maximum relative aperture and in out-of-focus areas positioned further on.

Venus Optics LAOWA 7.5 mm f/2 MFT - Chromatic and spherical aberration

Now let’s check lateral chromatic aberration – below we show a graph with its performance depending on aperture values.

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As you see that aberration correlates weakly with the relative aperture, ranging from 0.05% to 0.07% all the time. Such results can be only described as low so the lateral aberration correction of the Laowa seems to be beyond reproach.

Olympus E-M5 II, RAW, f/2.0	Olympus E-M5 II, RAW, f/8.0

Spherical aberration

The lens didn’t have any focus shift effect so we don’t think it has big problems with spherical aberration. We couldn’t perform another test concerning that aberration, consisting of comparing circles of light created in front of and behind the focus because of significant depth of field provided by the lens. It was simply impossible to get circles of the same size on both sides of the focal point. Still very high resolution values the Laowa gets in the frame centre at the maximum relative aperture is another argument showing that the spherical aberration is corrected in the right way.