Samyang AF 135 mm f/1.8 FE
5. Chromatic and spherical aberration
Chromatic aberration
The Samyang optics specialists took proper care of longitudinal chromatic aberration correction. Images, shown below, prove that the lens doesn't have any problems in this area even at the maximum relative aperture. |
Similar things can be said about the correction of lateral chromatic aberration – the performance of the lens shows a graph, presented below.
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At the maximum relative aperture the results are near 0.02-0.03%; on stopping down they drop to 0.01%. These results are simply sensational – even a tad better than the results of the Sony FE 135 mm f/1.8 GM, so praised by us in this part of the test.
| A7R III, RAW, f/1.8 | A7R III, RAW, f/8.0 |
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Spherical aberration
Even after a very close look it would be difficult to find any traces of focus shift in first photos of this chapter. Some symptoms of less-than-perfect correction of spherical aberration still can be visible in circles of light we got before and behind the focus: in the first case you get soft edges, in the second- a slightly accented rim. Still, this effect is not especially noticeable.Lack of focus shift and a good quality of images in the frame centre by f/1.8 indicate that problems with spherical aberration, even if present, aren't especially pronounced.
| A7R III, f/1.8, before | A7R III, f/1.8, after |
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