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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 0.4-0.5 of a second, a sensibly short time that doesn't depend on the direction of your work and doesn't get noticeably longer in weaker lighting conditions.

When it comes to the accuracy the Panasonic S 85 mm f/1.8 performs really well, without any significant misses, no matter whether we used it in the studio or outside.

We also didn't notice any front or back focus tendencies.

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Panasonic S1R II, 85 mm, f/1.8

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 basis of the recording above, comparing freeze-frames before and after oversharpening, we can estimate that the breathing of the tested lens amounts to about 14%. This means the borderline between high and very high level. I admit that I expected something better from a relatively new, fixed-focal lens from a company that is the most video-oriented optics manufacturer on the market. Of course we have to add that the much more expensive Leica APO-Summicron-SL 75 mm f/2 ASPH corrected focus breathing even worse.