Sony FE 50 mm f/1.4 GM review - Coma, astigmatism and bokeh

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Sony FE 50 mm f/1.4 GM

21 February 2023

Maciej Latałło

7. Coma, astigmatism and bokeh

The Sony FE 50 mm f/1.4 GM doesn't have any serious problems with coma. As long as you work with the APS-C detector that aberration is completely imperceptible. In the corner of full frame images of a diode start to elongate a bit but such effect is not especially pronounced. If you had to complain about anything you could say that stopping down the aperture by 1 EV doesn't decrease coma as much as it should have.

Center, f/1.4	Corner APS-C, f/1.4	Corner FF, f/1.4

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

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to just 2.7%. It's a very low level, once again nothing to worry about. In this category the new model fares much better than the faster FE 1.2/50 GM.

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Out-of-focus images look nice. Light spread in the circles is even, with barely visible onion-ring bokeh despite using aspherical elements. A brighter rim that appears on more significant stopping down of the aperture, is not especially intensive. Mechanical vignetting is a bit bigger problem as it can be bothersome even on stopping down the aperture by 2 EV.

Center, f/1.4	Corner APS-C, f/1.4	Corner FF, f/1.4

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