LensTip.com

Lens review

Sigma A 105 mm f/2.8 DG DN Macro

27 November 2020
Maciej Latałło

7. Coma, astigmatism and bokeh

The Sigma A 105 mm f/2.8 DG DN Macro corrects coma in an exceptionally way. This aberration level is so low that you could switch these thumbnails at random and it would be difficult to notice any difference. Once again the Japanese lens deserves only to be praised.

Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh
Center, f/4.0 Corner APS-C, f/4.0 Corner FF, f/4.0
Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh


Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 2.9% and we consider it to be a very low level. As you see, also in this category the lens's performance is beyond reproach.


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Out-of-focus images, generated by the tested Sigma, are also very nice. Light spread in the circles is very even and a brighter rim, appearing on stopping down, is the only feature that might turn your attention. Mechanical vignetting is a different matter, though. It remains visible even on stopping down the aperture by 2 EV; still we are going to tackle that topic in the next chapter.

Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh
Center, f/4.0 Corner APS-C, f/4.0 Corner FF, f/4.0
Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh
Center, f/5.6 Corner APS-C, f/5.6 Corner FF, f/5.6
Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh Sigma A 105 mm f/2.8 DG DN Macro - Coma, astigmatism and bokeh