LensTip.com

Lens review

Sigma A 105 mm f/1.4 DG HSM

10 July 2018
Arkadiusz Olech

7. Coma, astigmatism and bokeh

The Sigma A 1.4/105 deals with coma correction exceedingly well. In the corner of the APS-C/DX sensor the image of a diode is completely free of any deformations. Some traces of these you can spot only in the corner of full frame but even there you can hardly talk about any problems. In this area the Sigma performs better than the Nikkor 1.4/105 as its coma was on a medium level.

Center, f/1.4 Corner APS-C, f/1.4 Corner FF, f/1.4
Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh
Center, f/2.0 Corner APS-C, f/2.0 Corner FF, f/2.0
Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh


When it comes to astigmatism, understood as an average difference between horizontal and vertical MTF50 values, we don’t have any reservations either. The value measured by us amounted to 4.5% and it means you don’t have to think about that aberration at all. Still it’s worth adding that the Nikkor 1.4/105E ED performed better, with a result of just 1.8%.


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A fast portrait lens should be able to provide pleasant blurry areas and in this category we don’t have any complaints. Circles of light are very nice and smooth, without any local extremes. Even the rim, which appears on stopping down, is not especially intensive. What’s important, mechanical vignetting disappears practically completely on stopping down the aperture to f/2.0 while in the case of the Nikkor it influenced heavily circles even by f/2.8. The difference in dimensions of these two lenses makes itself felt.

Center, f/1.4 Corner APS-C, f/1.4 Corner FF, f/1.4
Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh
Center, f/2.0 Corner APS-C, f/2.0 Corner FF, f/2.0
Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh
Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh Sigma A 105 mm f/1.4 DG HSM - Coma, astigmatism and bokeh