Sony E PZ 10-20 mm f/4 G review - Coma, astigmatism and bokeh

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Sony E PZ 10-20 mm f/4 G

6 June 2022

Maciej Latałło

7. Coma, astigmatism and bokeh

The Sony PZ E 10–20 mm f/4 G doesn't have any serious problems with coma correction. In the frame corner the point-like image of a diode changes into a slight comma but the effect is not especially pronounced. What's important, a similar performance can be observed for all focal lengths.

A7R III, 10 mm, f/4.0, center	A7R III, 10 mm, f/4.0, Corner

A7R III, 15 mm, f/4.0, center	A7R III, 15 mm, f/4.0, Corner

A7R III, 20 mm, f/4.0, center	A7R III, 20 mm, f/4.0, Corner

When it comes to astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, it is 10.2%, a result on the borderline between low and medium levels. You should also add that this aberration is a tad higher in the 10-15 mm range and the lowest at the maximum focal length.

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You have to admit out-of-focus images provided by the Sony 10-20 mm aren't the most pleasing to the eye; still nobody expects a lens with such parameters to produce nice blurr or creative DOF play.

A7R III, 20 mm, f/4.0, center	A7R III, 20 mm, f/4.0, Corner

A7R III, 20 mm, f/5.6, center	A7R III, 20 mm, f/5.6, Corner

A7R III, 20 mm, f/8.0, center	A7R III, 20 mm, f/8.0, Corner