Sony E 15 mm f/1.4 G review - Coma, astigmatism and bokeh

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Sony E 15 mm f/1.4 G

1 June 2022

Maciej Latałło

7. Coma, astigmatism and bokeh

The photos below show clearly that coma is not corrected in a perfect way and it adversely affect image quality on the frame edges. Still you have to emphasize the fact that you don't deal with an especially high level and images of a diode are influenced by just coma, as they are turned into a slight comma. Aberrations of higher degree that are responsible for characteristic 'wings' are corrected very well.

In this category the Sony fares better than the Sigma that had to deal not only with coma but also with aberrations of higher degree. In its case, these tell-tale 'wings' were well pronounced and didn't disappear completely even on stopping down the aperture by 1 EV.

A7R III, f/1.4, center	A7R III, f/1.4, Corner

A7R III, f/2.0, center	A7R III, f/2.0, Corner

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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 5.9%, so its influence on image quality is slight. It should also be mentioned that this result is mainly influenced by the maximum relative aperture; a slight stopping down limits it in a significant way. Once again the Sony fares noticeably better than the Sigma.

Taking into account the fact that you deal here with a wide angle lens blurry areas don't make us worried. The light spread in the circles is quite even but you can notice onion-ring bokeh, caused by aspherical elements present in the optical construction. We have to admit the performance of the Sigma in this category we liked a tad better.

Mechanical vignetting is easily noticeable at the maximum relative aperture; it decreases distinctly by f/2.0 and disappears practically completely by f/2.8.

A7R III, f/1.4, center	A7R III, f/1.4, Corner

A7R III, f/2.0, center	A7R III, f/2.0, Corner

A7R III, f/2.8, center	A7R III, f/2.8, Corner