Sigma C 24 mm f/2 DG DN review - Image resolution

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Sigma C 24 mm f/2 DG DN

7 December 2021

Maciej Latałło

4. Image resolution

Our resolution test (resolution meaning the MTF50 function values) of Sony FE lenses is based on RAW files from the 42.4 Mpix sensor of the Sony A7R II or the Sony A7R III camera. In the case of this kind of detector the decency level we set about 39-41 lpmm and the best fixed-focal lenses have been able to reach a level of 75-80 lpmm. Record-breaking lenses exceed slightly 80 lpmm and, so far, our list of record-breakers features the Voigtlander Apo Lanthar 50 mm f/2 E (81.0 lpmm) and the Sigma C 65 mm f/2 DG DN (82.7 lpmm).

Let's check how the Sigma C 24 mm f/2 DG DN compares – below you can find a graph with its results in the frame centre and on edges of the APS-C and full frame sensors.

Sigma C 24 mm f/2 DG DN - Image resolution

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The values you see are far from record-breaking ones but still you can enjoy the performance of the Sigma. The lens exceeds distnictly 50 lpmm already at the maximum relative aperture so its images, generated at that point, are of good quality. The lens reaches the peak of its performance by f/4.0 and in that place the MTFs exceed a very high level of 70 lpmm.

In case of a wide angle lens edges of the frame are important and the Sigma fares very well in that area, contrary to many other mirrorless constructions, not having very pronounced differences between the centre and the edge of the frame. At the maximum relative aperture and on both types of detectors the resolution exceeds 46 lpmm, guaranteeing you good image quality without any serious problems. On stopping down the aperture the lens reaches a very good level of 60 lpmm on the edge of the APS-C sensor and on the edge of full frame it lands above 55 lpmm. It seems in this category the Sigma doesn't have any weaknesses.

How the Sigma C 2/24 compares to its direct rivals? Let's glance at another graph.

The Sigma and the Sony 2.8/24G are neck and neck – their results are comparable within the margin of error. In fact Sony resolution points are situated even a tad higher even though the lens is slower aperture-wise - it only proves that the Sony model is a very well-put-together lens. The Sigma and the Sony fare much better than the faster Samyang 1.8/24 and the expensive Batis 2/25 and it is a piece of very good news for both of these lenses. It seems the Sigma really has a lot to offer to any potential user.

At the end of this chapter, traditionally, we present crops taken from photos of our resolution testing chart saved in JPEG format alongside RAW files which we used for the analysis above.

A7R III, JPEG, 24 mm, f/2.0