LensTip.com

Lens review

Sigma C 24 mm f/2 DG DN

7 December 2021
Maciej Latałło

7. Coma, astigmatism and bokeh

In the resolution chapter we praised the Sigma for its image quality on the edge of the frame. Photos below show clearly that quality was reached by a solid curbing of coma among other things. The aberration is visible only in the corner of full frame but even there it should be called slight.

Center, f/2.0 Corner APS-C, f/2.0 Corner FF, f/2.0
Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh
Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh


Astigmatism, understood as an average difference between vertical and horizontal MTF50 values, amounted to 6.0% and it is a low level – in this area the lens should be praised once again.


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Optical construction of the Sigma 2/24 features two aspherical elements and their influence is visible in defocused light circles. They are not smooth, with a slightly accented onion ring bokeh. The overall image seems to be quite sensible for a wide angle lens. It's also worth noticing that mechanical vignetting makes itself felt by f/2.0 and f/2.8, disappearing by f/4.0.

Center, f/2.0 Corner APS-C, f/2.0 Corner FF, f/2.0
Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh
Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh
Center, f/4.0 Corner APS-C, f/4.0 Corner FF, f/4.0
Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 24 mm f/2 DG DN - Coma, astigmatism and bokeh