Sony E 11 mm f/1.8 review - Coma, astigmatism and bokeh

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Sony E 11 mm f/1.8

2 June 2022

Maciej Latałło

7. Coma, astigmatism and bokeh

The Sony E 11 mm f/1.8 doesn't correct coma in a perfect way. Images of a diode are noticeably enlarged in the frame corners at the maximum relative aperture. You can spot not only a slight elongation of the point-like image, an effect produced by classic coma, but also side 'wings', caused by aberrations of even higher degree. On stopping down the lens by 1 EV both effects are greatly reduced but still some slight deformations remain.

Although the performance, observed here, is far from perfect it cannot be called very problematic either. It is something in-between, a medium level that, with these parameters and at this price-point, is only natural.

A7R III, f/1.8, center	A7R III, f/1.8, Corner

A7R III, f/2.5, center	A7R III, f/2.5, Corner

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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 5.8% so its influence on image quality is slight. Still, it's worth mentioning that it's the f/2.8 aperture, not, as usual, the maximum relative aperture, that contributes the most to that value. It solves the mystery of the local minimum on resolution graphs we got on the edge of the frame.

The appearance of out-of-focus areas is really good for a wide angle lens. Light spread in the circles is quite even and onion-ring bokeh, caused by aspherical elements, is just moderately bothersome. We also didn't notice any serious problems with mechanical vignetting.

A7R III, f/1.8, center	A7R III, f/1.8, Corner

A7R III, f/2.5, center	A7R III, f/2.5, Corner

A7R III, f/3.5, center	A7R III, f/3.5, Corner