Samyang AF 35 mm f/1.8 FE review - Coma, astigmatism and bokeh

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Samyang AF 35 mm f/1.8 FE

7 May 2021

Maciej Latałło

7. Coma, astigmatism and bokeh

We expected that the tested lens would deal with coma better and we were a tad disappointed. At the maximum relative aperture you can notice a slight influence of that aberration even in the corner of the APS-C sensor; on full frame you won't have any problems with observing it at all. Fortunately stopping down the aperture by 1 EV helps a lot and such a move is able to reduce coma to an acceptable level.

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

Astigmatism, understood and an average difference between horizontal and vertical MTF50 function values, amounted to 9.4% and it is a result on the borderline between low and medium level. No reasons to complain here.

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Appearance of out-of-focus images can be called sensible and nothing more. You can spot concentric circles in discs, a result of using aspherical elements in the construction. Discs in frame corners feature noticeably brighter rims and also mechanical vignetting makes the whole situation worse, as it remains visible even on stopping down the aperture by 2 EV.

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

Center, f/3.5	Corner APS-C, f/3.5	Corner FF, f/3.5