LensTip.com

Lens review

Sigma C 35 mm f/2 DG DN

8 January 2021
Maciej Latałło

7. Coma, astigmatism and bokeh

Coma remains completely invisible in the area limited by the size of the APS-C sensor but when you get to corners of full frame you can notice slight deformations – point-like diode images get some 'wings' which are, in fact, not a symptom of classic coma but of higher degree aberrations. The Sigma manages in this category noticeably better than the Sony FE 1.8/35 and as well as the more expensive Batis.

Center, f/2.0 Corner APS-C, f/2.0 Corner FF, f/2.0
Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh
Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh


Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values amounted to 10.5% and it is a medium value. Even though its direct rivals fared better in this category we don't have any serious reasons to complain.


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Defocused circles of light look sensibly well but nothing more than that. Three aspherical elements inside the lens make themselves felt here - you can notice distinct onion ring bokeh. As a kind of solace you should mention the fact that mechanical vignetting disappears almost completely on stopping down the lens to a value of f/2.8.

Center, f/2.0 Corner APS-C, f/2.0 Corner FF, f/2.0
Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh
Center, f/2.8 Corner APS-C, f/2.8 Corner FF, f/2.8
Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh
Center, f/4.0 Corner APS-C, f/4.0 Corner FF, f/4.0
Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh Sigma C 35 mm f/2 DG DN - Coma, astigmatism and bokeh