Samyang 50 mm f/1.4 AS UMC
5. Chromatic and spherical aberration
At the maximum relative aperture the longitudinal chromatic aberration can be noticed but its level is not high. On stopping down the aperture to f/2.0 that aberration decreases even further and it can be seen pretty clearly in photos presented below.
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The tested lens has almost no problems whatsoever with the lateral chromatic aberration. Near the maximum relative aperture its level is low; on stopping down it increases but despite that trend it reaches just a borderline between low and medium values.
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Spherical aberration
The lens doesn’t have any „focus shift” tendency but still the spherical aberration is not corrected in a perfect way. You can notice it in defocused circles which feature a very distinct ring – darker in front of the focus, lighter behind the focus. That effect disappears only by f/2.0 so the spherical aberration contributes noticeably to the worsening of the image quality by f/1.4; it stops being bothersome after a slight stopping down of the aperture.
