Samyang 10 mm f/2.8 ED AS NCS CS
5. Chromatic and spherical aberration
The longitudinal chromatic aberration in ultra wide-angle lenses is never a big problem and the Samyang 2.8/10 is not an exception to that rule. The photo, shown below, mate by f/2.8 aperture shows clearly that aberration is controlled very well.
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It would be also difficult to have any major reservations concerning the lateral chromatic aberration. Its level is weakly correlated with the aperture value, staying in a range from 0.10% to 0.12% considered as average.
Here the Samyang sticks out in a positive way when compared to the Tokina which, at 11 mm, could show the aberration level reaching 0.27%. The Samyang is also better than the Sigma but this time only slightly so because the Sigma at 10 mm had the chromatic aberration on a level of 0.13%.
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In this category the tested lens can only be praised. Keeping the lateral chromatic aberration in check in an ultra wide-angle lens is very difficult and many producers have found out that much in a painful way. The Samyang managed to keep it in check so it never became distinct.
Spherical aberration
In the case of such a huge depth of field as the one provided by the tested lens it is not possible to get circles of light in front of and behind the focus of a sensible size. Still the spherical aberration didn’t present any symptoms such as a ‘focus shift’ effect so we think it is corrected in a good way.
