Samyang AF 75 mm f/1.8 FE review - Coma, astigmatism and bokeh

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Samyang AF 75 mm f/1.8 FE

12 November 2020

Maciej Latałło

7. Coma, astigmatism and bokeh

Unfortunately the tested Samyang cannot be praised for coma correction. At the maximum relative aperture that aberration appears already in the corner of the APS-C sensor and in the corner of full frame its level is really high. Luckily the problem decreases noticeably on stopping down the aperture by 1 EV but still, it must be said in this category the Samyang lags behind the Sony FE 1.8/85.

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 as an average difference between horizontal and vertical MTF50 function values, amounted to 6.7% and we consider it to be a low level, not giving you any reasons to complain.

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Out-of-focus images are really nice. The light spread in the circles is even, without any local extremes. Even a lighter rim that appears after a more significant stopping down is not especially intensive. Mechanical vignetting is a problem for a change, as it remains visible even on stopping down the lens 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