Panasonic Leica DG Nocticron 42.5 mm f/1.2 Asph. P.O.I.S.
5. Chromatic and spherical aberration
The correction of the longitudinal chromatic aberration is not a strong point of this lens and crops, shown below, prove that much. You can see the cast in images out of focus not only at the maximum relative aperture but also on stopping down by 1EV.
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The lateral chromatic aberration, for a change, is corrected very well. The results we got ranged from 0.03 to 0.05% so its level can be described as very low.
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Spherical aberration
When it comes to spherical aberration it is corrected well enough not to give you the “focus shift” effect – as shown quite clearly in the first image of this chapter. Its delicate influence, however, can be noticed in photos of defocused light points.
In the case of an image in front of the focus you deal with a slightly darker rim; the image behind the focus is a bit lighter in the very middle. Fortunately that effect is not very pronounced so we can say the spherical aberration is controlled properly.
