LensTip.com

Lens review

Samyang 50 mm f/1.4 AS UMC

3 December 2014
Arkadiusz Olech

5. Chromatic and spherical aberration

Chromatic 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.

Samyang 50 mm f/1.4 AS UMC - Chromatic and spherical aberration


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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.

Samyang 50 mm f/1.4 AS UMC - Chromatic and spherical aberration

Samyang 50 mm f/1.4 AS UMC - Chromatic and spherical aberration

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.

Samyang 50 mm f/1.4 AS UMC - Chromatic and spherical aberration