LensTip.com

Lens review

Sigma C 24 mm f/2 DG DN

7 December 2021
Maciej Latałło

8. Vignetting

First let's check the vignetting performance on the smaller APS-C sensor – appropriate thumbnails can be found below.

A7R II, APS-C, f/2.0 A7R II, APS-C, f/2.8
Sigma C 24 mm f/2 DG DN - Vignetting Sigma C 24 mm f/2 DG DN - Vignetting


In this case you get some chances to notice vignetting only at the maximum relative aperture were it amounts to 24% (−0.80 EV). By f/2.8 it decreases to 12% (−0.36 EV), and by f/4.0 it is 11% (−0.34 EV).


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Of course after passing to full frame there are far more problems and photos, shown below, prove that much.

A7R II, FF, f/2.0 A7R II, FF, f/2.8
Sigma C 24 mm f/2 DG DN - Vignetting Sigma C 24 mm f/2 DG DN - Vignetting
A7R II, FF, f/4.0 A7R II, FF, f/5.6
Sigma C 24 mm f/2 DG DN - Vignetting Sigma C 24 mm f/2 DG DN - Vignetting


At the maximum relative aperture vignetting reaches a huge level of 69% (−3.36 EV) – moderate physical dimensions of the lens make themselves felt. When you stop down the aperture to f/2.8 the aberration, described here, decreases to a still very high level of 55% (−2.28 EV). Even by f/4.0 and f/5.6 vignetting levels are easy to spot, as our measurements showed, respectively, 38% (−1.40 EV), and 32% (−1.14 EV). As if it wasn't enough, further stopping down of the aperture didn't have any measureable effect on light fall-off.

Sony A7R III, JPEG, f/2.0
Sigma C 24 mm f/2 DG DN - Vignetting