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Chromatic aberration

Photos shown below prove clearly that the Sony FE 20-70 mm f/4 G doesn't have any problems with longitudinal chromatic aberration. If you look closely at out-of-focus areas you can spot some colouring but it's not an effect that might cause any problems in real life photos. We think the tested lens should be praised here.

When it comes to lateral chromatic aberration the bar was set much higher. It's difficult to curb this aberration in a universal zoom lens that offers you wide angles of view and here you deal with unique combination of the 3.5x zoom and an angle of view approaching almost 100 degrees. Nobody else has tackled such a task before and it certainly wasn't easy.

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Let's see how the tested lens fared in this category: drawings below present the performance of chromatic aberration depending on focal lengths and aperture values. The first drawing concerns the edge of the APS-C sensor, the second one – the edge of full frame.

We are very pleasantly surprised. You won't find even medium values at any combination of focal length and aperture, all of them fit low or very low levels. It is a really impressive achievement – a round of applause!

A7R III, RAW, 20 mm, f/11.0	A7R III, RAW, 70 mm, f/11.0

Spherical aberration

While both types of chromatic aberration are corrected in a proper way, you can't say the same about spherical aberration. Its influence is visible as slight focus shift and light spread in out-of-focus circles we got before and behind the focus. Perhaps differences between them aren't distinct but in one case you get a clearly accented rim and the other circle lacks it completely. It is a classic example of imperfect correction of spherical aberration. The performance of the lens is not ideal so it can't be praised in this category but we think you shouldn't criticize it too much either.

A7R III, 50 mm, f/4.0, before	A7R III, 50 mm, f/4.0, after

A7R III, 70 mm, f/4.0, before	A7R III, 70 mm, f/4.0, after