Sigma A 35 mm f/1.2 DG II review

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Sigma A 35 mm f/1.2 DG II

30 March 2026

Maciej Latałło

7. Coma, astigmatism and bokeh

Combining the 64 deg angle of view and the f/1.2 aperture means the bar is set pretty high when it comes to coma correction. The previous version of the Sigma performed sensibly well in this area but its successor goes one step further. In the corner of the APS-C/DX sensor you can't notice practically any traces of coma and in the corner of full frame you see just a slight enlargement of images of a diode. The performance in this category can be described as good.

Center, f/1.2	Corner APS-C, f/1.2	Corner FF, f/1.2

Center, f/1.8	Corner APS-C, f/1.8	Corner FF, f/1.8

To make our test more comprehensive, we decided to show crops taken from photos of night sky taken from the right-hand upper corner of full frame. This time we show images taken by f/1.2, f/1.8, and f/2.5. In the star test the lens performed similarly well as in case of the diode – you see mainly slight enlargement of images of stars with some sideways rays of light. These effects disappear practically completely on stopping down the aperture by 2 EV.

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Corner FF, f/1.2	Corner FF, f/1.8	Corner FF, f/2.5

Astigmatism, understood as an average difference between horizontal and vertical MTF50 values, amounted to exactly 3%. It's a very low level, which shouldn't worry you. Actually, the Sigma fares here the best out of all 1.2/35 class lenses, tested by us so far.

Defocused circles of light, provided by the Sigma 1.2/35, look sensibly well. Its optical construction features a lot of aspherical elements so the onion ring bokeh is just visible and very slightly accented. The interior of the circles show a quite even light spread and the outer rim is not especially intense. Everything looks sensibly well. Mechanical vignetting is a bit of a problem, though. At the maximum relative aperture, its level is high and it remains noticeable even on stopping down the aperture by 2 EV.

Center, f/1.2	Corner APS-C, f/1.2	Corner FF, f/1.2

Center, f/1.8	Corner APS-C, f/1.8	Corner FF, f/1.8

Center, f/2.5	Corner APS-C, f/2.5	Corner FF, f/2.5