Nikon Nikkor Z 28-75 mm f/2.8 review - Chromatic and spherical aberration

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Nikon Nikkor Z 28-75 mm f/2.8

22 November 2023

Maciej Latałło

5. Chromatic and spherical aberration

Chromatic aberration

In a zoom 28-75 mm lens as fast as f/2.8 it's not easy to correct longitudinal chromatic aberration and here Nkon optics specialists should be praised. As you can see in the photos below the tested lens doesn't have any problems with this aberration even at the maximum relative aperture.

Nikon Nikkor Z 28-75 mm f/2.8 - Chromatic and spherical aberration

Now let's check the situation with lateral chromatic aberration – below you can find a graph presenting its performance depending on focal length and aperture values for the edges of the APS-C/DX sensor and full frame.

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As you can see at the shortest focal lengths there are no visible problems wit this type of aberration as it is situated on the borderline between very low and low levels. At the same time we start to understand why the resolution of the Nikkor on the edge of the frame at the maximum focal length was so unsatisfactory. Lateral chromatic aberration is certainly one of the reasons - its level increases very quickly on stopping down the aperture and from f/8.0 it reaches already medium values.

Z7, RAW, 28 mm, f/5.6	Z7, RAW, 75 mm, f/16.0

Spherical aberration

First shot from this chapter show that the tested lens doesn't feature any focus shift problems either in the centre of the focal range, or at the 75 mm focal length. Spherical aberration is certainly not a serious problem here but still it is not corrected in a perfect way either; defocused circles of light show it very clearly. For both focal lengths we examined the circle behind the focus had a brighter rim and such an effect is one of symptoms of not completely corrected spherical aberration.