Sigma A 35 mm f/1.2 DG DN review - Chromatic and spherical aberration

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Sigma A 35 mm f/1.2 DG DN

11 September 2019

Arkadiusz Olech

5. Chromatic and spherical aberration

Chromatic aberration

Longitudinal chromatic aberration is not corrected perfectly well because slight colouring of out-of-focus images is discernible even on stopping down. Still that problem is not big or even medium, especially that, with such a great aperture fastness, the standards were set very high in this category.

Sigma A 35 mm f/1.2 DG DN - Chromatic and spherical aberration

Now let's check how the Sigma A 35 mm f/1.2 DG DN corrects lateral chromatic aberration – its performance presents a graph below.

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Here the tested lens fares beyond reproach – the majority of positions on the detector and aperture values generate results on a completely imperceptible level of 0.03%. A tad higher level, which still should be called low, you can observe near the maximum relative aperture and on the edge of the APS-C sensor.

A7R II, RAW, f/1.2	A7R II, RAW, f/5.6

Spherical aberration

First photos, presented in this chapter, don't show any 'focus shift' effect but the correction of spherical aberration is not ideal. It's enough you glance at out-of-focus circles of light: the one before the focus doesn't feature anything alarming but the one after the focus has a distinct, bright rim.