Sony FE 28 mm f/2 review - Coma, astigmatism and bokeh

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Sony FE 28 mm f/2

8 April 2019

Arkadiusz Olech

7. Coma, astigmatism and bokeh

One glance at pictures below and you understand better the lens's weaker performance on the edge of the frame in the proximity of the maximum relative aperture. Coma and other aberrations which are deforming images of a diode are very noticeable even in the corner of the APS-C sensor. In the corner of full frame, by f/2.0, images are similar to the ones coming from 10-15-year-old optical constructions. Fortunately on stopping down the aperture to f/2.8 coma becomes distinctly limited, even though it remains visible. All of this means the lens should be berated in this category for sure.

Center, f/2.0	Corner APS-C, f/2.0	Corner FF, f/2.0

Center, f/2.8	Corner APS-C, f/2.8	Corner FF, f/2.8

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 8.4% which we consider a moderate value – no reasons to complain here.

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Defocused circles of light look sensibly well, especially for a wide angle lens. In the middle of the circle you can notice a slight effect of onion rings bokeh (connected, most likely, to the presence of aspherical elements inside the lens) but it is not especially intensive. Mechanical vignetting seems to be a more serious problem, as, by f/2.0 and f/2.8, it truncates the circles in frame corners rather strongly.

Center, f/2.0	Corner APS-C, f/2.0	Corner FF, f/2.0

Center, f/2.8	Corner APS-C, f/2.8	Corner FF, f/2.8

Center, f/4.0	Corner APS-C, f/4.0	Corner FF, f/4.0