Samyang AF 45 mm f/1.8 FE
5. Chromatic and spherical aberration
Chromatic aberration
One low dispersion glass element inside the tested Samyang is perhaps not enough. Longitudinal chromatic aberration remains quite visible and makes itself felt not only at the maximum relative aperture but also on stopping down the lens by 1 EV. |
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As you can see, the graphs are quite flat, with values fluctuating near low and very low levels. It means you won't encounter almost any problems in this area.
| A7R II, RAW, f/1.8 | A7R II, RAW, f/5.6 |
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Spherical aberration
In first photos of this chapter you can notice a very slight trace of 'focus shift' effect – depth of field seems to move toward greater distances when you pass from f/1.8 to f/2.5. Still that effect is really subtle.However, when you examine defocused circles of light you might find other traces of spherical aberration. The circle behind the focus features a quite even light spread but the one we got before the focus has a lighter rim.
Both effects, described here, indicate that spherical aberration of the Samyang 1.8/45 is not corrected in a perfect manner. .
| A7R II, f/1.8, before | A7R II, f/1.8, after |
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