Viltrox AF 85 mm f/1.4 Pro
10. Autofocus and focus breathing
Autofocus
The tested lens is equipped with the Hyper VCM motor so focusing is supposed to be silent and quick. When it comes to the level of noise indeed, we have no reservations whatsoever – during focusing the lens is practically noiseless. When it comes to the speed we can't call the Viltrox a speed demon but its results are really sensible. A typical time of focusing and confirming the focus amounts to about 0.5-0.6 of a second. This value remained similar no matter what cameras we used in our test, the Sony A7R IIIa or the Sony A7R V.The accuracy of the autofocus was good but not outstanding. There were misses both during our studio test and testing outdoors but their number kept 5-10%.
When it comes to front or back focus tendencies we didn't notice any of them on any of 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 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:
