Viltrox AF 85 mm f/2 EVO
10. Autofocus and focus breathing
Autofocus
The tested lens is equipped with an STM motor so focusing is supposed to be silent and quick. When it comes to noise level we have no objections whatsoever – during focusing the lens remains completely silent. When it comes to the speed, the lens is not especially quick but its results are sensible, with a typical focusing time and confirming the focus ranging from about 0.5 to 0.6 of a second. This time was very similar on both bodies we used in our test, the Sony A7R IIIa and the Sony A7R V.At the same time we can praise the accuracy of the autofocus – it remained flawless, no matter what camera body we used, outside and inside the studio.
We also didn't notice any problems with front or back focus tendencies.
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| A7R IIIa, f/2.0 |
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| A7R V, f/2.0 |
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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.A frame change ranging from 0 to 5% we consider to be low. Between 5 and 10% you can speak about medium levels. Usually such values constitute also the maximum efficiency level of any breathing compensation algorithms, present in some bodies. Between 10 and 15% focus breathing is high, above 15% its level can be called very high.
Below we present the test video of the Viltrox lens:
