Sigma A 24 mm f/1.4 DG HSM review - Chromatic and spherical aberration

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Sigma A 24 mm f/1.4 DG HSM

8 March 2015

Arkadiusz Olech

5. Chromatic and spherical aberration

Chromatic aberration

When it comes to the longitudinal chromatic aberration neither the Canon EF 24 mm f/1.4L USM II, nor the Nikkor AF-S 24 mm f/1.4G distinguished themselves. The Canon’s level was huge, the Nikkor’s – medium. How the Sigma fares here? Let’s glance at photos below.

Sigma A 24 mm f/1.4 DG HSM - Chromatic and spherical aberration

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The aberration is noticeable both by f/1.4 and by f/2.0 but its level is not high. You can say it is somewhere near the borderline between medium and low values. The Sigma compares favourably with its rivals.

Now let’s check its lateral chromatic aberration correction. The graph below shows its performance on the edge of the APS-C sensor and full frame.

Here the Sigma A 1.4/24 definitely deserves our praise. At the maximum relative aperture the results reach less than 0.05% so a very low level. On stopping down the aberration increases but it never exceeds 0.09% so never gets near even medium values.

The rivals presented here a slightly worse performance. The Canon had values of 0.07–0.09%, no matter what sensor or aperture you applied and the Nikkor’s aberration near the maximum relative aperture increased to 0.10% and then dropped to 0.07–0.08% on stopping down.

Canon 5D III, f/1.4	Canon 5D III, f/8.0

Spherical aberration

The tested lens didn’t have any ‘focus shift’ effect which suggest the spherical aberration level cannot be high. The crops below prove that as well: the light circles we got in front of and behind the focal point don’t differ so the spherical aberration correction seems to be good – no serious complaints here.