Panasonic Lumix S 18 mm f/1.8
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 0.3 of a second, a really outstanding result. This time doesn't depend on the direction of your work and doesn't extend noticeably in weaker lighting conditions.At the same time the angle of view of the lens offers you such a significant depth of field that the task of the autofocus is not especially difficult when it comes to accuracy. In this area we didn't experience any significant problems, no matter whether we worked in the studio or outdoors.
We didn't notice any front or back focus tendencies either.
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| Panasonic S1R II, 18 mm, f/1.8 |
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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:
