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Lens review

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

30 April 2019
Maciej Lata││o

7. Coma, astigmatism and bokeh

The coma correction of the tested lens seems to be beyond reproach. In the corners of the APS-C/DX sensor you can't notice practically any deformations of the circular images of a diode. In the very corner of full frame there are some deviations from point-like images of a diode but the effect is very slight and visible just at the maximum relative aperture.

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 OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - 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 OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - 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 OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh
Center, 280ámm, f/4.0 Corner APS-C, 280ámm, f/4.0 Corner FF, 280ámm, f/4.0
Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh


When it comes to astigmatism, an average difference between horizontal and vertical MTF50 function values amounted to 7.1%. It wasn't a perfect result but still you can call it good. After attaching the 1.4x teleconverter the performance becomes a tad weaker because astigmatism increases to 11.3%.

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The out-of-focus areas obtained by this lens should be praised - it's enough you glace at our sample shots and out-of-focus circles of light, presented below, seem to confirm that impression. The light spread is very even, without any noticeable local extreme points, with just slightly accented rim. The only thing that might make you worried is noticeable mechanical vignetting. In the corner of the full frame sensor the circle of light remains truncated even on stopping down the aperture to f/5.6. It doesn't look good.

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 OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh
Center, 135ámm, f/4.0 Corner APS-C, 135ámm, f/4.0 Corner FF, 135ámm, f/4.0
Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh
Center, 135ámm, f/5.6 Corner APS-C, 135ámm, f/5.6 Corner FF, 135ámm, f/5.6
Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh Sigma S 70-200 mm f/2.8 DG OS HSM - Coma, astigmatism and bokeh