Nikon Nikkor Z 26 mm f/2.8
5. Chromatic and spherical aberration
Chromatic aberration
The optical construction of the Nikkor Z 26 mm f/2.8 is not especially complex, and it doesn't feature any low dispersion glass element either. Some problems concerning chromatic aberration correction were only to be expected and yet we didn't find any.Photos below show clearly that longitudinal variant of this aberration is corrected properly well never becoming bothersome even at the maximum relative aperture.
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Similar things you can say about lateral chromatic aberration and the graph below is the proof.
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On the edge of full frame you deal with a very low level; on the edge of the APS-C/DX sensor it is just low. It seems this aberration won't cause you any serious problems so the constructors of this midget should be praised here again.
| Nikon Z7, RAW, f/2.8 | Nikon Z7, RAW, f/5.6 |
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Spherical aberration
First photos of this chapter don't show any 'focus shift' effect and it means spherical aberration is not especially high. It is confirmed by the appearance of defocused circles of light we got before and behind the focus – they look more or less the same. A bit more accented rim in the circle behind the focus is the only thing that you can notice. Fortunately this effect is not especially pronounced.
| Nikon Z7, f/2.8, before | Nikon Z7, f/2.8, after |
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