Yongnuo YN 50 mm f/1.8
5. Chromatic and spherical aberration
The longitudinal chromatic aberration of the tested lens is almost invisible. It is an interesting result, different from that of the Canon 1.8/50 II, where the aberration, although not very high, was definitely more pronounced.
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When it comes to the lateral chromatic aberration the situation is reversed. For the Canon it reached maximally 0.05% and decreased on stopping down. The Yongnuo results are two times higher – mind you it doesn’t mean the situation is bad. Even at the maximum relative aperture the values can be described as medium and on stopping down they decrease to low levels. To tell you the truth the Yongnuo fares similarly to the Nikkor AF-S 50 mm f/1.8G which had the lateral aberration on a level of 0.08% no matter what aperture you used.
When it comes to correcting both types of chromatic aberration the Yongnuo YN 50 mm f/1.8 deserves our praise. As you see it is possible to eliminate that aberration even if you deal with just a simple, 6-element construction.
| Canon 5D III, f/1.8 | Canon 5D III, f/8.0 |
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Spherical aberration
The Yongnuo YN 50 mm f/1.8 didn’t have any „focus shift” effect so the level of spherical aberration of the lens can’t be very high. The light circles we got in front of and behind the focus differ from each other but still the situation is dissimilar to that of the Canon - its circles showed a more classic influence of spherical aberration.
| Canon 5D III, f/1.8, in front of | Canon 5D III, f/1.8, behind |
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