Sony FE 85 mm f/1.4 GM II
10. Autofocus and focus breathing
Autofocus
We had an opportunity to assess the quality of the autofocus joining the lens with the Sony A7R IIIa and the Sony A7R V cameras. In both cases the performance was noiseless and quick. Running through the whole distance range and confirming the focus took about 0.4 of a second, a very good result. That result doesn't depend on the direction and, at the same time, the mechanism didn't get lost in weaker lighting conditions.When we tested the lens outside we noticed a bit more wavering with the older camera, the Sony A7R IIIa, usually while shooting from shorter distances. With the newer A7R V we didn't notice such an effect at all.
When it comes to front or back focus tendency we didn't notice any of it on either of the bodies, used in our test.
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| A7R IIIa, f/1.4 |
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| A7R V, f/1.4 |
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Focus breathing
Focus breathing tests show refraiming 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.A change of the frame ranging from 0 to 5% we consider to be low. Between 5 and 10% we can speak about a medium level. Usually these are also maximum values compensation algorithms, present in some bodies, can effectively deal with. A high level constitute results between 10 and 15%, more than 15% means a very high level.
The test video of the new Sony lens is presented below:
