LensTip.com

Lens review

Yongnuo YN 50 mm f/1.8

26 January 2015
Szymon Starczewski

6. Distortion

Classic 50 mm devices usually have barrel distortion and the Yongnuo 1.8/50 is not an exception to that rule. On the smaller Canon 50D sensor the level of that aberration was negligible and we determined its value as –0.33%. A bit more problems you can see on full frame where the distortion reaches –0.98% but still that value is low.

The chart below shows how the tested lens compares with its rivals.


Nikkor
AF-S 1.8/50G
Nikkor
AF 1.8/50D
Yongnuo
1.8/50
Canon
EF 1.8/50 II
Minolta
1.7/50
APS-C/DX
−0.49%
−0.20%
−0.33%
−0.39%
−0.30%
FF
−1.18%
−0.49%
–0.98%
–1.28%
−0.68%

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The distortion category is another proof that the construction of the Yongnuo differs from that of the Canon as the Chinese lens fares better on detectors of both types. As on the smaller one the difference is within the range of measurement error, on full frame it amounts to 0.3%. It is still the 3-sigma level but really on its very border. With a good probability we can write that the Yongnuo 1.8/50 corrects the distortion better than the Canon 1.8/50.

Canon 50D, 50 mm
Yongnuo YN 50 mm f/1.8 - Distortion
Canon 5D MkIII, 50 mm
Yongnuo YN 50 mm f/1.8 - Distortion