Nikon Nikkor AF-S 28 mm f/1.4E ED
5. Chromatic and spherical aberration
Chromatic aberration
Fast optics produced by Nikon often experiences problems with longitudinal chromatic aberration. In the case of the tested Nikkor the constructors didn’t manage a perfect performance either – that aberration is easily noticeable. Even on stopping down the aperture to f/2.0 you still see a slight colouring of defocused images.As you see the complex optical construction didn’t help and neither did two ED elements. Perhaps the classic low dispersion glass, still used by Nikon, is the problem. Other producers often employ ultra low dispersion glass or fluorite-type glass. The Sigma A 24 mm f/1.4 DG HSM is a good example of that trend, with three FLD elements inside made of low dispersion glass with fluorite properties. Compared to that those two ED Nikkor elements seem rather modest.
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The level of this aberration decreases slightly with the increase of aperture values but even at the maximum relative aperture it amounts to 0.05–0.06% so is low. It would be difficult to notice it in real life photos.
| Nikon D3x, RAW, f/1.4 | Nikon D3x, RAW, f/8.0 |
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Spherical aberration
The first photo of this chapter doesn’t feature any ‘focal shift’ symptoms. What’s more, below we show circles of light created in front of and behind the focus which are very similar. Both these facts combined make us claim the tested lens has no problems with spherical aberration.| Nikon D3x, f/1.4, in front of | Nikon D3x, f/1.4, behind |
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