Nikon Nikkor Z 400 mm f/4.5 VR S
5. Chromatic and spherical aberration
Chromatic aberration
As we've already written in previous chapters, the tested Nikkor doesn't lack optical elements made of low dispersion glass and that's why we are not especially surprised that its results when it comes to the longitudinal chromatic aberration correction are splendid. It's enough to look at thumbnails, shown below. It's also worth adding that the situation doesn't gets worse after attaching the brand name 1.4x teleconverter. In both cases the tested set performs very well indeed. |
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Now let's check the situation in case of lateral chromatic aberration.
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You shouldn't have the slightest reservations here because, no matter what detector you employ, all results land safely below 0.04% and it means that they remain always very low. Lateral chromatic aberration won't be bothersome at all.
The situation changes noticeably when you attach the 1.4x teleconverter and we the graph below shows it well.
Observed values are higher now, even though you still can describe them as low. The results on the edge of the APS-C/DX sensor momentarily approach medium levels. It's nothing worrisome overall but it certainly influences the resolution on the edge of the frame in a negative way, as it was shown in the previous chapter.
| Nikon Z7, 400 mm, RAW, f/8.0 | Nikon Z7, 560 mm (TC), RAW, f/11.0 |
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Spherical aberration
First photos of this chapter don't show any focus shift effect and it means spherical aberration level cannot be that high. The appearance of out-of-focus circles of light confirms that much – there are no visible differences between them. A slightly more accented rim in the circle you got behind the focus is the only noticeable difference but, fortunately, such an effect is not very pronounced and doesn't give almost any reasons to lower our assessment in this category.
| Nikon Z7, 400 mm, f/4.5, before | Nikon Z7, 400 mm, f/4.5, after |
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| Nikon Z7, 560 mm (TC), f/5.6, before | Nikon Z7, 560 mm (TC), f/5.6, after |
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