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Lens review

Sigma S 70-200 mm f/2.8 DG DN OS

8 April 2024
Maciej Lata││o

7. Coma, astigmatism and bokeh

The photos below show very clearly that the Sigma S 70-200 mm f/2.8 DG DN OS doesn't have any significant problems with coma correction. Deformations of point-like images of a diode are very slight even in the very corner of full frame and don't give you any reasons to complain.

Center, 70ámm, f/2.8 Corner APS-C, 70ámm, f/2.8 Corner FF, 70ámm, f/2.8
Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh
Center, 135ámm, f/2.8 Corner APS-C, 135ámm, f/2.8 Corner FF, 135ámm, f/2.8
Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh
Center, 200ámm, f/2.8 Corner APS-C, 200ámm, f/2.8 Corner FF, 200ámm, f/2.8
Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh


Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 9.6%, a value on the borderline between low and medium levels. Once again no serious reservations about this result.


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The appearance of defocused circles of light is sensible. Taking into account the fact that you deal here with a zoom lens. There are traces of onion-ring bokeh but they are really slight (after all the optical system of this lens does feature aspherical elements) and you can barely spot a brighter rim on the edge. Mechanical vignetting, though, can bother you a bit, very distinct by f/2.8, quite noticeable by f/4.0, and still visible by f/5.6. The same effect we observed while testing the more expensive Sony model though.

Center, 200ámm, f/2.8 Corner APS-C, 200ámm, f/2.8 Corner FF, 200ámm, f/2.8
Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh
Center, 200ámm, f/4.0 Corner APS-C, 200ámm, f/4.0 Corner FF, 200ámm, f/4.0
Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh
Center, 200ámm, f/5.6 Corner APS-C, 200ámm, f/5.6 Corner FF, 200ámm, f/5.6
Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG DN OS - Coma, astigmatism and bokeh