Panasonic Lumix S Pro 50 mm f/1.4
10. Autofocus and focus breathing
Autofocus
The autofocus of the tested lens joined with the Panasonic Lumix S1R II camera is completely noiseless and quick. Running through the whole distance range and confirming the focus takes typically about 0.5 of a second, a sensibly short time. This time doesn't depend on the direction of your work and doesn't extend noticeably in weaker lighting conditions.When it comes to the accuracy of the autofocus it was simply perfect, both outside and in our testing studio. In this area the tested lens can be only praised.
We didn't notice any front or back focus tendencies either.
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| Panasonic S1R II, 50 mm, 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 Panasonic lens:
On the one hand a company that emphasizes video recording shoud have taken care of the correction of focus breathing in their lens a bit more. On the other hand you should remember the tested lens is already several years old and focus breathing is an element that has been included by the producers only recently.
