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Autofocus

First we tested the lens by attaching it to an older body, namely the Sony A7R III. In this case the autofocus performance was completely noiseless and quick. Running through the whole distance range, which is huge by the way, took about 0.5-0.6 of a second at 70 mm and 0.6-0.7 of a second at the maximum focal length. Of course you have to remember about the focus limiter, which you can set at a range from 3 meters to infinity – after employing it the focusing time can be shortened to an excellent value of 0.2-0.3 of a second.

Then we attached the lens to a newer body, the Sony A7R V and...practically nothing changed. Once again the autofocus performance was very quick, very silent, and efficient.

The accuracy of the mechanism also should be praised – it was simply exemplary, no matter what body we used in our test and no matter whether we shot outside or in the studio.

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Photos below also prove that the tested lens didn't have any problems whatsoever with front or back focus.

A7R III, 100 mm, f/4.0

A7R III, 200 mm, f/4.0

A7R V, 135 mm, f/4.0

A7R V, 200 mm, f/4.0

Focus breathing

Focus breathing tests show reframing images as you oversharp them. We conduct the test by manually passing from the minimum focusing distance to infinity with the aperture stopped down; then we check how the field of view of the lens changed as a result. The test video of the tested Sony lens is presented below:

After comparing freeze-frames from this video we can estimate that focus breathing of the tested lens for both focal length we used amounts to about 5%. It is a sensible value, noticeable in practice only when you change the distance scale very quickly. It also fits easily a range that can be compensated by an appropriate 'focus breathing' algorithm, offered by the newest Sony bodies.