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Fujifilm Fujinon XF 16-50 mm f/2.8-4.8 R LM WR

3 February 2025
Maciej Latałło

10. Autofocus and focus breathing

Autofocus

The autofocus of the Fujinon XF 16-50 mm f/2.8-4.8 R LM WR, joined with the Fujifilm X-T2 camera, is completely noiseless and very quick. Running through the whole distance range and confirming the focus takes usually about 0.3 of a second, a very good result. What's important, this value doesn't depend on the direction of work and the focal length.

The accuracy of the mechanism also deserves a very high note. We didn't notice any problems, no matter whether we shot photos outside or in our studio – a round of applause!

We also didn't observe any front or back focus tendencies, no matter what focal length we employed.


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X-T2, 50 mm, f/4.8
Fujifilm Fujinon XF 16-50 mm f/2.8-4.8 R LM WR - Autofocus and focus breathing

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.

The test video of the Fujinon lens is presented below:

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 4% at the shortest focal length and to about 8% at 50 mm. As you see we speak here about low and medium levels of this aberration so breathing problems shouldn't worry you although its correction is hardly perfect. Taking into account the fact that you deal here with significant changes of aperture fastness along the changes of focal lengths it seems that this lens won't be the first choice of fans of video recording so there is no need to criticize it a lot.